Why is the Sky Blue on Quora?

Quora does not moderate any questions asked to it, unlike Wikipedia where volunteers continually proof and correct articles in order to create a reliable information source. Quora simply lacks this feature. Unfairly placing value on questions at the expense of answer authors who spend hours crafting detailed replies would be silly. Quora should devise a …

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Why is the Sky Blue?

Have you ever found yourself looking up on a sunny day and wondering why the sky appears blue? Turns out there’s an excellent explanation! The color of the sky is determined by how sunlight interacts with our atmosphere. Sunlight passes through air molecules, scattering in all directions with blue hues being more heavily dispersed than …

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The Spacecraft Cemetery

Engineers usually place decommissioned spacecraft into graveyard orbits to reduce the likelihood of colliding with active satellites or even other spacecraft. However, larger objects like space stations that don’t explode upon reentry are sent to a spacecraft cemetery located at Point Nemo in the Pacific Ocean. What is a spacecraft cemetery? Spacecraft cemeteries are designated …

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The Life Cycle of Plants

Students can act out the life cycle of a plant. Start by having students curl themselves into tight balls as seeds. Under optimal conditions, seeds sprout and become seedlings, before developing into mature plants producing flowers and setting seeds which are dispersed through wind, water or animals, continuing the cycle. Seed Every plant begins life …

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