What follows is an opinion from a United States Court of Appeals.
Intervenors who participated as parties at the courts of appeals should be counted as either appellants or respondents when it can be determined whose position they supported. For example, if there were two plaintiffs who lost in district court, appealed, and were joined by four intervenors who also asked the court of appeals to reverse the district court, the number of appellants should be coded as six.
In some cases there is some confusion over who should be listed as the appellant and who as the respondent. This confusion is primarily the result of the presence of multiple docket numbers consolidated into a single appeal that is disposed of by a single opinion. Most frequently, this occurs when there are cross appeals and/or when one litigant sued (or was sued by) multiple litigants that were originally filed in district court as separate actions. The coding rule followed in such cases should be to go strictly by the designation provided in the title of the case. The first person listed in the title as the appellant should be coded as the appellant even if they subsequently appeared in a second docket number as the respondent and regardless of who was characterized as the appellant in the opinion.
To clarify the coding conventions, consider the following hypothetical case in which the US Justice Department sues a labor union to strike down a racially discriminatory seniority system and the corporation (siding with the position of its union) simultaneously sues the government to get an injunction to block enforcement of the relevant civil rights law. From a district court decision that consolidated the two suits and declared the seniority system illegal but refused to impose financial penalties on the union, the corporation appeals and the government and union file cross appeals from the decision in the suit brought by the government. Assume the case was listed in the Federal Reporter as follows:
United States of America,
Plaintiff, Appellant
v
International Brotherhood of Widget Workers,AFL-CIO
Defendant, Appellee.
International Brotherhood of Widget Workers,AFL-CIO
Defendants, Cross-appellants
v
United States of America.
Widgets, Inc. & Susan Kuersten Sheehan, President & Chairman
of the Board
Plaintiff, Appellants,
v
United States of America,
Defendant, Appellee.
This case should be coded as follows:Appellant = United States, Respondents = International Brotherhood of Widget Workers Widgets, Inc., Total number of appellants = 1, Number of appellants that fall into the category "the federal government, its agencies, and officials" = 1, Total number of respondents = 3, Number of respondents that fall into the category "private business and its executives" = 2, Number of respondents that fall into the category "groups and associations" = 1.
Note that if an individual is listed by name, but their appearance in the case is as a government official, then they should be counted as a government rather than as a private person. For example, in the case "Billy Jones & Alfredo Ruiz v Joe Smith" where Smith is a state prisoner who brought a civil rights suit against two of the wardens in the prison (Jones & Ruiz), the following values should be coded: number of appellants that fall into the category "natural persons" =0 and number that fall into the category "state governments, their agencies, and officials" =2. A similar logic should be applied to businesses and associations. Officers of a company or association whose role in the case is as a representative of their company or association should be coded as being a business or association rather than as a natural person. However, employees of a business or a government who are suing their employer should be coded as natural persons. Likewise, employees who are charged with criminal conduct for action that was contrary to the company policies should be considered natural persons.
If the title of a case listed a corporation by name and then listed the names of two individuals that the opinion indicated were top officers of the same corporation as the appellants, then the number of appellants should be coded as three and all three were coded as a business (with the identical detailed code). Similar logic should be applied when government officials or officers of an association were listed by name.
Your specific task is to determine the total number of appellants in the case that fall into the category "natural persons". If the total number cannot be determined (e.g., if the appellant is listed as "Smith, et. al." and the opinion does not specify who is included in the "et.al."), then answer 99.

Opinion:
THOMSON v. PENNSYLVANIA R. CO.
No. 7131.
Circuit Court of Appeals, Sixth Circuit.
Feb. 11, 1937.
Harford A. Toland, of Columbus, Ohio (Paul M. Herbert, of Columbus, Ohio, on the brief), for appellant.
R. H. Treffinger, of Columbus, Ohio (Henderson, Burr, Randall & Porter, of Columbus, Ohio, on the brief), for appellee.
Before HICKS, SIMONS, and ALLEN, Circuit Judges.
SIMONS, Circuit Judge.
The appellant, a citizen of Ohio, while employed by the appellee, a Pennsylvania corporation, at the latter’s engine house machine shop in the city of Columbus, Ohio, was injured. He brought suit for damages, based upon the negligence of his employer in failing to furnish him with proper tools for the performance of the work upon which he was engaged, and upon appeal assigns error in the direction of a verdict for the defendant.
On the day of the accident the appellant was engaged in turning a main engine driving rod by means of a steel bar inserted into one of the bearings of the rod. His explanation of the accident is that the bar slipped from the bearing and caused him to be thrown violently to the floor. A main driving rod is one that gives direct power from the steam chamber of a locomotive to its wheels. The rod here in question was 6' long, 6" wide, and 4" thick, and weighed somewhere between 1650 and 2000 pounds. It rested upon horses approximately 30 inches from the floor. At each end of the rod is a hole in which is seated a circular brass bushing or bearing, the hollow inside of which is approximately 10 inches in diameter and 8 inches deep extending through and beyond the sides of the rod. In fitting new brasses to the rod it became necessary to turn the rod on the horses or trestle. For this purpose a hexagon shaped steel pin bar 6% to 7 feet long, and about 1% inches in diameter, was provided. The pin bar was slightly flat at one end and tapered for about 2 inches at the opposite end. There was also available a chain hoist, the use of which was optional, although the plaintiff testified that at the time of the accident the chain hoist was not in position where it could be safely employed to turn the rod upon which he was engaged.
In turning the rod with the pin bar the practice was to insert the bar in the bearing hole so that it extended 3 inches below the lower end of the bearing, making a fulcrum on the upper and opposite end of the bearing and pulling over toward the operator until the rod was based upon it narrow edge. The turning operation was completed by the workman going to the other side of the rod and similarly by means of the pin bar turning the rod over upon its flat side. The appellant, when injured, had entered upon the first step of the turning operation. He was a slight man, weighing but 123 pounds, and upon his first effort was unable to bring the rod over. As he describes the accident, he had inserted the rod in the bearing hole in the usual manner, and, when he had raised it about two-thirds of the way he put his left foot up against the end of the rod to keep it from tipping, and got out as far as he could on the pin bar. His right foot was 4 to 6 inches from the floor, he was pulling with the right foot extended downward, and “this pin bar slipped out, shooting me to the floor like I was shot out of a caterpillar.”
In support of his contention that the steel pin bar was not a safe tool, the appellant testified that previous to his employment in the defendant’s roundhouse machine shop he had been employed for about five years in the defendant’s fit-up shop at Columbus, first as a machinist’s helper and later as a machinist; that there he had been instructed in turning rods to use a wooden pole 4%' to 5' long and 2%" square at its lower end and rounded at the grip end, that he was not to use a steel pin bar, as it was liable to slip out of the bearing. Upon his return to the employ of the defendant after 2 years’ leave of absence, and after his transfer to the roundhouse machine shop, he noticed the absence of wooden poles for use in turning engine rods. He asked the foreman where the wooden poles were and was told that they used the steel pin bar and that he was to use it. Two weeks later he asked the foreman “Are you going to get any wooden poles here to work with?” and the reply was, “No, we break too many — the other men use a steel pin bar and you go ahead and use it.” Later he again asked that wooden poles be supplied and was told to “forget it.” He told the foreman that he had heard of a workman known as “Sailor Boy” having been injured using a pin bar, and. the foreman then promised he would get some wooden poles. This allayed his fears and he returned to work. On the morning of the accident, finding it difficult to turn the rod, he asked a fellow workman to aid him, and, while they were both pulling on the pin bar inserted in the bearing, the foreman came to him and said: “This is a one man job. If jrou can’t do the work alone go to the office and get your time.” He then continued the work alone..
The defense to the action below was a general denial and the affirmative defense of assumption of risk in the use of a simple tool, and election by the appellant to use the pin bar rather than the chain hoist. Ruling upon the motion for directed verdict at the conclusion of all of the evidence, the District Judge, finding no question to exist as to realization of real or fancied danger by the appellant in the use of the steel bar, and in reliance upon our decision in Hallstein v. Pennsylvania R. Co., 30 F.(2d) 594, granted the motion on the ground that the appellant had assumed the risk incurred in the use of the tool.
Before reaching any question of assumption of risk, however, the primary question is whether there has been actionable negligence on the part of the defendant, and this, 'of course, involves not only failure to exercise due care but the causative relation of such failure to the injury. The burden of proof being upon the plaintiff to establish actionable negligence, the issue as to both its elements is clearly raised by a motion for peremptory instructions based upon the failure of the evidence to sustain a verdict. While all important facts were sharply in issue, we view the plaintiff’s evidence, as under familiar rules we must, in the light most favorable to him. The only asserted neglect on the part of his employer was the furnishing of the steel pin bar instead of a wooden pole as a tool for .the turning of an engine drive rod, and this, neglect is said to constitute negligence because the steel bar is not as safe a tool as a wooden pole. But this we think falls short of comprising substantial evidence that the steel bar is not a reasonably safe tool for such purpose in the hands of an experienced workman following instructions and familiar common practice governing its use. The rule is well settled that the master is not bound to provide the safest and best contrivance in order to meet the legal requirement of reasonable care, Louisville & N. R. Co. v. Davis, 75 F.(2d) 849, 850 (C.C.A. 6), and cases there cited. Nor is reasonable scientific judgment subject to review by a jury.. Hylton, Administratrix v. Southern Ry. Co., 87 F.(2d) 393, decided by us January 13, 1937. While there is evidence that under some circumstances a wooden pole may be less prone to .slip .than a steel bar, there is also evidence, uncontroverted, that it is more prone to break, and,, without more proof than the record affords, it would, of course, be submitting, the issue but to speculation and guess to permit the jury to pass upon the relative-safety of the two instruments. Moreover, it is indisputably established by the record that the steel bar, without thought of' hazard, had been in use for turning operations in the machine shop for many years — 15 years according to the memory of one witness and 27 years within the-memory of another. The only proof at all indicative of danger in the use of the steel bar was a bit of hearsay in reference to injury to the workman known as-Sailor Boy, but even this fails to show how the accident happened or that it was-due to the slipping of the bar in the rod bearing. Under these circumstances, there-was failure of evidence to' show actionable negligence, afld no error was committed in peremptorily instructing the jury for the defendant.
Another consideration supports our conclusion. The pin bar is a lever, and a lever is not only a simple tool but indeed the simplest of all tools. Its function and manner of use is intuitively grasped even by those least accustomed to tools. It is, we think, incredible that the pin bar, inserted into the bearing hole as described, with force exerted thereon as indicated, could have slipped. It is the law of the lever, to be found in any elementary text-book on physics, that the moment of the effort is equal to the moment of the resistance. Theoretically, therefore, the force operating to retain the bar in position equals the force exerted at the point of its application. A proper positioning of the lever would have effectively locked it against movement, and neither the bar, the resistance, nor the fulcrum failed. The irresistible inference therefore is that the bar was not properly inserted in the first instance or was permitted to get out of place between the appellant’s first and second effort to turn the rod. Failing in credibility since necessary physical facts refute it, the evidence in this respect does not rise to the dignity of substantial evidence. Southern Railway Co. v. Walters, 284 U.S. 190, 52 S.Ct. 58, 76 L.Ed. 239; Ristucci v. Norfolk & W. Ry. Co., 60 F.(2d) 28, 29 (C.C.A. 6). Our conclusion on the question of actionable negligence makes it unnecessary to consider the issue with respect to assumption of risk.
The judgment is affirmed.

Question: What is the total number of appellants in the case that fall into the category "natural persons"? Answer with a number.

Choices:

Answer: 1