Problem: 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: "Who are the astronaut that weighed less on the moon?"

Answer: "Edwin E. Aldrin Jr"
Answer: yes

Problem: Relying on an animal to come by is risky. A flower may have to wait a long time for the right animals to come by. What if one never passes close enough to the flower? Hoping the wind will blow is also risky for a plant. What if the wind does not blow? What if the blowing pollen does not land on another flower? The wind could even blow the pollen over the ocean where it is wasted. Giving free nectar is costly. It is not a good use of the plants energy. A plant uses a lot of energy to produce nectar. Some animals may just drink the nectar. They may not carry off any pollen in return. To improve their chances, plants evolved special traits. For example, they developed ways to hide their nectar. Only certain animals were able to get at the plants hidden nectar. These specific animals might be more likely to visit only flowers of the same species. This was also a benefit for some animals. Animals also evolved special traits to get to the nectar.

Question: "What problems could arise if a plant waits for the wind to help it?"

Answer: "The blowing pollen does not land on another flower"
Answer: yes

Problem: I've been thinking about the mindwipe, now two days away. Who said that those who forget the past are doomed to repeat it? I fear that may be true for me. Add this to the reasons I write now: to remember something, perhaps even to learn -- Emil Malaquez arrived after sundown, carrying a small package wrapped in what looked like real paper. His evening dress was formal, expensive, and slightly stained, as that of all forgetful artists should be. He was a jovial man with an easy laugh, and even uglier than Tasha had suggested. I liked him immediately. "Senor Malaquez?" "Please. Call me Emil. You must be Bernardo. Tasha's told me much about you." "All of it outrageous praise?" "All of it." "Ah, she is wonderfully perceptive." He raised an eyebrow, then guffawed. "Has she said as much about me?" "She thinks you are a genius. Do come in." "Thank you."

Question: "Who has Tasha spoken much about Bernardo to?"

Answer: "To Emil Malaquez"
Answer:
yes