instruction:
In this task, you will be presented with a context passage, a question about that paragraph, and a possible answer to that question. The task is to check the validity of the answer. Answer with "Yes" or "No".
question:
The idea that Earth is a magnet is far from new. It was first proposed in 1600 by a British physician named William Gilbert. Knowing it acts like a magnet is one thing. Knowing why it acts like a magnet is more difficult. In fact, finding out why is a fairly recent discovery. To find out why required new technology. It was the seismograph that made it possible to learn why the Earth acted like a magnet. Seismograph are used to study earthquakes. By studying earthquake waves they were able to learn about Earths interior. They discovered that Earth has an inner and outer core. The outer core consists of liquid metals, mainly iron and nickel. Scientists think that Earths magnetic field is generated here. It is caused by the motion of this liquid metal. The liquid metal moves as Earth spins on its axis. <sep>How does Earth create its magnetism?<sep>Earth has an inner and outer core. consists of liquid metals, mainly iron and nickel.Earths magnetic field is generated here
answer:
Yes

question:
On December 4, as news came in about the discoveries in Jordan, National Security Council (NSC) Counterterrorism Coordinator Richard Clarke wrote Berger, "If George's [Tenet's] story about a planned series of UBL attacks at the Millennium is true, we will need to make some decisions NOW." He told us he held several conversations with President Clinton during the crisis. He suggested threatening reprisals against the Taliban in Afghanistan in the event of any attacks on U.S. interests, anywhere, by Bin Laden. He further proposed to Berger that a strike be made during the last week of 1999 against al Qaeda camps in Afghanistan-a proposal not adopted. Warned by the CIA that the disrupted Jordanian plot was probably part of a larger series of attacks intended for the millennium, some possibly involving chemical weapons, the Principals Committee met on the night of December 8 and decided to task Clarke's Counterterrorism Security Group (CSG) to develop plans to deter and disrupt al Qaeda plots. Michael Sheehan, the State Department member of the CSG, communicated warnings to the Taliban that they would be held responsible for future al Qaeda attacks." Mike was not diplomatic," Clarke reported to Berger. With virtually no evidence of a Taliban response, a new approach was made to Pakistan. 13 General Anthony Zinni, the commander of Central Command (CENTCOM), was designated as the President's special envoy and sent to ask General Musharraf to "take whatever action you deem necessary to resolve the Bin Laden problem at the earliest possible time." But Zinni came back emptyhanded. As Ambassador William Milam reported from Islamabad, Musharraf was "unwilling to take the political heat at home." The CIA worked hard with foreign security services to detain or at least keep an eye on suspected Bin Laden associates. Tenet spoke to 20 of his foreign counterparts. Disruption and arrest operations were mounted against terrorists in eight countries. In mid-December, President Clinton signed a Memorandum of Notification (MON) giving the CIA broader authority to use foreign proxies to detain Bin Laden lieutenants, without having to transfer them to U.S. custody. The authority was to capture, not kill, though lethal force might be used if necessary.16Tenet would later send a message to all CIA personnel overseas, saying, "The threat could not be more real. <sep>When do the events in the whole article take place?<sep>Late 1999
answer:
Yes

question:
Responding to a wave of public dismay over the first designs for rebuilding Lower Manhattan, Gov. George Pataki has sent word that it's time to go back to the drawing board. It is the right message, sent while it is still early enough to do something constructive about the disappointing quality of the work so far. The governor, like Mayor Michael Bloomberg, now seems committed to creating a better mix of uses for ground zero, and a 24-hour community in Manhattan's downtown. While rethinking the plans will delay the original rebuilding schedule slightly, it does not need to stall progress if the governor keeps the pressure on the Lower Manhattan Development Corp. and the Port Authority of New York and New Jersey. New York cannot afford to have a gaping hole that mocks the city and its process for rebuilding what was destroyed. Pataki openly questioned the Port Authority's requirement that any plan for the site replace all the office, hotel and retail square footage lost in the attack on Sept. 11. More than anything else, that specification limited the designs to the undistinguished options presented two weeks ago. Renegotiating that issue with the World Trade Center leaseholders should begin immediately. Opening the process to other designers, both here and internationally, will help separate this urban plan from the ordinary. The city also needs to begin openly discussing what happens underground, in particular with the transportation network. At this point, planners have focused on short-term repair of PATH and subway lines, with medium-range proposals being shopped in Washington that could untangle the disorganized web of subway lines downtown. Within the next few weeks the Lower Manhattan Development Corp. and the Port Authority should offer some bigger ideas about how to connect the downtown area better to the rest of the region. Lowering West Street alongside the World Trade Center site and building a park or esplanade on top is another option that has been popular with those reviewing the first six public proposals. But it would be expensive, and the governor, the mayor and their friends in Washington will have to look at long-range ways to pay the bill. Pataki's recent remarks are a sign that he understands how central the rebuilding of Lower Manhattan will be to his own political legacy. Now he needs to follow through with action, to keep demonstrating that his core concern is coming up with the best possible plan, not simply keeping the issue on hold until after this fall's election. <sep>What is the issue in building a park on the world trade center site<sep>Not safe
answer:
No