How does a nail become a magnet when it is placed in a strong magnetic field?

Nasa scientists must work together to make sure that everything is correct and accounted for when launching a shuttle. besides a physicist, what other type of scientist would be in making sure that the shuttle has the appropriate type and amount of fuel to reach its destination?

In the respiration-photosynthesis cycle shown above, what are the products of cellular respiration that belong in box 2?

In "the pig," what is the main effect that the piglet initially has on kibuka?