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How many states, or provinces or other divisions, are there in the world? – Noé, 8, Minneapolis The exact answer is hard to come by – for now. Your question has actually sparked scholars to start talking about compiling an official, authoritative database. Right now the best estimates land somewhere between 3,600 and 5,200, across the world’s roughly 200 nations. It depends on whether you collect data from specific nations’ own information, the CIA World Factbook or the International Standards Organization. There are 195 national governments recognized by the United Nations, but there are as many as nine other places with nationlike governments, including Taiwan and Kosovo, though they are not recognized by the U.N. ....
How did humans evolve, and will they evolve more? – Anya T., 13, Brookline, Massachusetts Everything that is alive today has evolved, including human beings. Our ancestors evolved many traits that helped them survive in their environments, and we still have many of those traits today. Two of the most important and consequential traits are walking on two legs and having a large brain. I’m a scholar of human evolution. I study how evolution works, including how it has changed the shape of the bones in the skull and ankle of humans and other primates. So how did humans evolve, and where will evolution take us in the future? ....
How did humans evolve, and will they evolve more? – Anya T., 13, Brookline, Massachusetts Everything that is alive today has evolved, including human beings. Our ancestors evolved many traits that helped them survive in their environments, and we still have many of those traits today. Two of the most important and consequential traits are walking on two legs and having a large brain. I’m a scholar of human evolution. I study how evolution works, including how it has changed the shape of the bones in the skull and ankle of humans and other primates. So how did humans evolve, and where will evolution take us in the future? ....
How do astronauts go to the bathroom in space? – Henry D., age 7, Cambridge, Massachusetts Whether you use a hole in the ground or a fancy gold-plated toilet, on Earth, gravity pulls your waste down and away from you. For astronauts, “doing their duty” is a bit more complicated. Without gravity, any loose drops or dribbles could float out of the toilet. That’s not good for astronauts’ health, nor for the sensitive equipment inside the space station. I study volcanoes on other planets, and I’m interested in how people can work in extreme environments like space. So how do you go to the bathroom in space or on the International Space Station? Carefully – and with suction. ....