A man has a goat, a wolf, and a head of cabbage. He comes to a river that has no bridge, but a small boat to cross the river. The boat can hold only one of the three things he has. If he takes over the wolf first, the goat will eat the cabbage. If…

A quick test of intelligence. Don’t cheat! Because if you do, the test will be no fun. There are no Tricks to the test. Read this sentence: Now count aloud the F’s in that sentence. Important, count them ONLY ONCE: do not go back and count them again. Once it’s done, go see the answer.…

Einstein wrote the following riddle. He said that 98% of the world could not solve it. But several NIEHS scientists were able to solve it, and they said it’s not all that hard if you pay attention and are very patient. Give it a try: There are 5 houses in 5 different colors in a…