Problem: Boron has two naturally occurring and stable isotopes, 11B (80.1%) and 10B (19.9%). The mass difference results in a wide range of 11B values, which are defined as a fractional difference between the 11B and 10B and traditionally expressed in parts per thousand, in natural waters ranging from 16 to +59. There are 13 known isotopes of boron, the shortest-lived isotope is 7B which decays through proton emission and alpha decay. It has a half-life of 3.51022 s. Isotopic fractionation of boron is controlled by the exchange reactions of the boron species B(OH)3 and tetrahydroxyborate. Boron isotopes are also fractionated during mineral crystallization, during H2O phase changes in hydrothermal systems, and during hydrothermal alteration of rock (geology). The latter effect results in preferential removal of the [10B(OH)4] ion onto clays. It results in solutions enriched in 11B(OH)3 and therefore may be responsible for the large 11B enrichment in seawater relative to both oceanic crust and continental crust; this difference may act as an isotopic signature.

Which isotope has a higher percentage, 10B or 11B?
Answer: 11B

Problem: Coming off their win over the Vikings the Giants played on home ground for an NFC East rivalry rematch against the Eagles. The Giants suffered their worst loss of the season, blowing a 24-3 halftime lead and allowing a punt return for a touchdown as time expired in regulation. In the first quarter the Giants took the early lead as QB Eli Manning completed a 35-yard TD pass to WR Mario Manningham. The Eagles responded in the second quarter with kicker David Akers getting a 34-yard field goal, but the Giants extended their lead after Manning found Manningham on a 33-yard TD pass, followed by kicker Lawrence Tynes nailing a 25-yard field goal, then with Manning getting an 8-yard TD pass to WR Hakeem Nicks. The Eagles cut the lead with QB Michael Vick making an 8-yard TD pass to WR Jeremy Maclin, but the Giants scored with Manning finding TE Kevin Boss on an 8-yard TD pass. However, they failed to maintain this lead with Vick making a 65-yard TD pass to TE Brent Celek, followed by his 4-yard scramble for a touchdown and then his 13-yard TD pass to Maclin to tie the game at 31. After the Giants went three and out Matt Dodge's punt was returned 65 yards for a touchdown by DeSean Jackson, giving the Giants a loss, and thus bringing their record down to 9-5. In calling the final play, Fox commentator Joe Buck said: Eagles broadcasters Merrill Reese and Mike Quick called the play on WYSP-FM in Philadelphia this way:

Which team allowed the most first half points?
Answer: Eagles

Problem: Without Brian Westbrook, but coming off their dominant defensive performance over the Steelers, the Eagles flew to Soldier Field for a Week 4 Sunday night duel with the Chicago Bears. The Bears started quickly, forcing a three-and-out, then scoring on three passing plays. DeSean Jackson was responsible for gaining 66 of the 74 yards traveled on the next drive, including a 22-yard touchdown reception from Donovan McNabb to tie the score. Kyle Orton passed to Marty Booker for a 23-yard touchdown to make it 14-7 Chicago in the second quarter, but the Eagles came right back with a quick drive ending in Correll Buckhalter scoring from a yard out. After a missed 50-yard field goal by David Akers, the Bears used the short field to set up a 20-yard touchdown pass to Devin Hester. Akers missed another field goal in the third quarter before making two short kicks that came after Kyle Orton fumbled. Robbie Gould booted a 41-yard kick to make it 24-20 Bears in the fourth quarter. McNabb then took the Eagles down the field, and with 5:40 left to play, Philadelphia had 1st-and-goal from the 4-yard line. Buckhalter got to the 1-yard line on first down, but he and Tony Hunt failed to score on second and third down. Andy Reid went for it on fourth down and Buckhalter was stuffed for no gain. The Bears killed most of the clock on their next drive and the Eagles fell 24-20. McNabb threw for 262 yards. Reggie Brown had 6 catches for 79 yards. The loss made the Eagles 2-2.

How many total games did the Eagles play this season after losing this game to the Bears?
Answer: 4

Problem: The Chiefs took an early lead on a 30-yard pass from Tyler Thigpen to Mark Bradley. The Chiefs defense continued to show improvement in the red zone, limiting the Chargers to two field goals instead of two touch downs. At the end of the first half, Thigpen threw a pass to 34yard touchdown pass to Tony Gonzalez. However, the extra point snap was botched and an attempt at a quick pass failed. The Chargers controlled the second half better than the first, scoring two touchdowns and leading the Chiefs by 7 at the end of the fourth quarter. The Chiefs' final drive ended with a 3-yard touchdown pass to Gonzalez. A 1-point PAT would tie the game. However, Herm Edwards told Thigpen to go for two, explaining in a post-game interview that the defense was too beat up for overtime play. The resulting two-point conversion ended in an incomplete pass. The Chiefs lost by one point.

How many points did the Chiefs score in the first half?
Answer:
13