On the periodic table, elements are arranged in order of what?
True or false: The moons Phobos and Deimos belong to planet Saturn?
What does a litmus test establish?
What did Benjamin Franklin invent?
What is fool's gold made of?
Which astronomer discovered Uranus whilst surveying the night sky through a telescope?
What is the process by which plants convert light energy into food known as?
What group of invertebrate animals have three pairs of legs and a body split into three parts?
Which famous scientist wrote to President Franklin D. Roosevelt in 1939 advising that the United States should focus on its own nuclear weapon research?
What is the first stage of the hydrologic cycle?