Science and Engineering » Space Sciences
Find out who the first African American in space was.
Find out why the color of the sun varies.
Learn why lunar eclipses happen and how long they last.
Science and Engineering » Nobel Prize Winners - Chemistry Physics Physiology and Medicine
Discover the first American-born winner of the Nobel Prize for Physiology or Medicine.
Science and Engineering » General Science and Technology
Find out who invented the compound microscope.
Science and Engineering » Physical Sciences
Learn the most abundant metallic element and where it's found.
These two elements are rich in isotopes.
Learn about the select group of elements known as noble metals.
Science and Engineering » Earth Sciences
Learn where luffa sponges come from and their commonly used names.
Learn where isinglass comes from and its many uses.
![The suit used by astronauts is sealed to protect the individual from the harsh elements of space. [©Shutterstock, 2010]](/image/125x125/2937_who_was_the_first_black_american_in_space.jpg)
![An orange sun sets into the sea. [©Shutterstock, 2010]](/image/125x125/3000_why_does_the_color_of_the_sun_vary.jpg)
![The lunar eclipse is one of the phases of the moon. [©Shutterstock, 2010]](/image/125x125/2966_why_do_lunar_eclipses_happen.jpg)
![The winner of this award showed how chromosomes function in heredity. [©Shutterstock, 2010]](/image/125x125/2570_who_was_the_first_american_born_winner_of_the_nobel_prize_for_physiology_or_medicine.jpg)
![Compound microscopes have at least two lenses. [©Shutterstock, 2010]](/image/125x125/2629_who_invented_the_compound_microscope.jpg)
![These food trays are made with the most abundant metallic element on earth. [©Shutterstock, 2010]](/image/125x125/2811_which_metallic_element_is_the_most_abundant.jpg)
![Isotopes are elements that share an atomic number, but differ in number of neutrons. [©Shutterstock, 2010]](/image/125x125/972_which_elements_have_the_most_isotopes.jpg)
![Noble metals are metals resistent to chemical reaction. [©Shutterstock, 2010]](/image/125x125/995_which_elements_are_the_noble_metals.jpg)
![Luffa sponges are a great way to exfoliate. [©Shutterstock, 2010]](/image/125x125/2826_where_does_a_luffa_sponge_come_from.jpg)
![The sturgeon is useful for more than just food. [©Shutterstock, 2010]](/image/125x125/2831_where_does_isinglass_come_from.jpg)