If you have a mass of 50 kg on Earth, what is your weight in newtons? An object with more mass is pulled by gravity with greater force. Mass and weight are closely related. However, the weight of an object can change if the force of gravity changes. On Earth, the force of gravity is the same everywhere. So how does the force of gravity change? It doesnt if you stay on Earth. What if we travel to another planet or moon in our solar system? Look at the photo of astronaut Edwin E. Aldrin Jr. taken by fellow astronaut Neil Armstrong in the Figure. They were the first humans to walk on the moon. An astronaut weighs less on the moon than he would on Earth. This is because the moons gravity is weaker than Earths. The astronauts mass, on the other hand, did not change. He still contained the same amount of matter on the moon as he did on Earth. If the astronaut weighed 175 pounds on Earth, he would have weighed only 29 pounds on the moon. If his mass on Earth was 80 kg, what would his mass have been on the moon? [Figure 3]

Question: "Why does an astronaut weigh less on the moon than on earth"

OPTIONS:
- no
- yes

Answer: "Because the gravity is weaker"

Response: yes

A handful of Bronze Age relics has fostered an assumption that prehistoric settlers inhabited Ibiza thousands of years ago. Greater evidence of such a people is found on Mallorca and Menorca than on Ibiza, but one of the Balearics' most important sites is actually on the island of Formentera, where the megalithic monument/tomb of Ca Na Costa has been dated to 2000 b.c. Ibiza's key location between Africa and ancient Iberia made it a convenient stopover for Mediterranean seafarers, such as the Phoenician traders, who called the island Ibosim. The Greeks dubbed it Ebysos, the Romans called it Ebusus, and the Moors, Yebisah. The Carthaginians: A detailed history of the island doesn't begin until it became a colony of Carthage in the 7th century b.c. . The Carthaginians originally came from the area comprising present-day Lebanon, and from their bases in North Africa and what's now Spain, they challenged the Roman Empire for domination of the Mediterranean region. Their interest in Ibiza lay partly in its vast salt flats, which to this day remain the source of a profitable industry. They capitalized on the natural resources by using the salt to cure fish, which they exported to their home country. The Carthaginians also carried out lead mining and continued to be of significance up until this century. It is believed that the lead pellets which were used by the Carthaginian general Hannibal were made on Ibiza. The Carthaginians also considered the island a holy place, and here in great splendour they buried thousands of their citizens in a huge necropolis on the Puig des Molins (Hill of the Windmills) below the Dalt Vila (Old Town) of Ibiza. Under the gnarled olive trees archaeologists have uncovered a treasure trove of statues, jewellery, pitchers, tools, and coins, which are now displayed in the town's two archaeological museums. The Romans never really infiltrated Ibiza, and even after the defeat of Hannibal in 202 b.c. during the Second Punic War their influence was restrained. Only with the fall of Carthage in 146 b.c. did they manage to make inroads, but, as local historians stress, Ibiza was neither conquered nor annexed by Rome, but confederated, retaining remarkable autonomy. For centuries to come the old Carthaginian traditions were allowed to continue on Ibiza alongside the new Roman way of life.

Question: "What did Carthaginians capitalize on in Ibiza?"

OPTIONS:
- no
- yes

Answer: "The natural resources"

Response: yes

Earths magnetic field helps protect Earth and its organisms. It protects us from harmful particles given off by the sun. Most of the particles are attracted to the north and south magnetic poles. This is where Earths magnetic field is strongest. This is also where relatively few organisms live. Another benefit of Earths magnetic field is its use for navigation. People use compasses to detect Earths magnetic north pole. Knowing this helps them tell direction. Many animals have natural 'compasses' that work just as well. Birds like the garden warbler in Figure 1.36 use Earths magnetic field. They use it to guide their annual migrations. Recent research suggests that warblers and other migrating birds have structures in their eyes. These structures let them see Earths magnetic field as a visual pattern.

Question: "What do birds use to help in migration?"

OPTIONS:
- no
- yes

Answer: "Sound echos off of objects"

Response: no

Recommendation: Congressional oversight for intelligence-and counterterrorism-is now dysfunctional. Congress should address this problem. We have considered various alternatives: A joint committee on the old model of the Joint Committee on Atomic Energy is one. A single committee in each house of Congress, combining authorizing and appropriating authorities, is another. The new committee or committees should conduct continuing studies of the activities of the intelligence agencies and report problems relating to the development and use of intelligence to all members of the House and Senate. We have already recommended that the total level of funding for intelligence be made public, and that the national intelligence program be appropriated to the National Intelligence Director, not to the secretary of defense. We also recommend that the intelligence committee should have a subcommittee specifically dedicated to oversight, freed from the consuming responsibility of working on the budget. The resolution creating the new intelligence committee structure should grant subpoena authority to the committee or committees. The majority party's representation on this committee should never exceed the minority's representation by more than one. Four of the members appointed to this committee or committees should be a member who also serves on each of the following additional committees: Armed Services, Judiciary, Foreign Affairs, and the Defense Appropriations subcommittee. In this way the other major congressional interests can be brought together in the new committee's work. Members should serve indefinitely on the intelligence committees, without set terms, thereby letting them accumulate expertise. The committees should be smaller-perhaps seven or nine members in each house-so that each member feels a greater sense of responsibility, and accountability, for the quality of the committee's work. The leaders of the Department of Homeland Security now appear before 88 committees and subcommittees of Congress. One expert witness (not a member of the administration) told us that this is perhaps the single largest obstacle impeding the department's successful development. The one attempt to consolidate such committee authority, the House Select Committee on Homeland Security, may be eliminated. The Senate does not have even this. Congress needs to establish for the Department of Homeland Security the kind of clear authority and responsibility that exist to enable the Justice Department to deal with crime and the Defense Department to deal with threats to national security.

Question: "What are some recommendations for fixing the dysfunctional way congressional oversight for intelligence and counter-terrorism are run right now?"

OPTIONS:
- no
- yes

Answer: "An intelligence Czar"

Response:
no