host picture

Question: April 2012 Archives

How do seeds know which direction to send up their shoots?


Plants sense gravity because gravity pulls the starches in the cells downward, and that indicates to the plant to grow upward.

When you take a cake out of the oven, the air inside the oven doesn't burn you, and touching the top of the cake doesn't burn you but touching the metal pan does. If they're all at the same temperature, why is there a difference?

The metal pan would burn you because of heat conductivity, or the measure of how rapidly heat can flow out of an object. Air is a poor conductor, but metal is a very good conductor.

In large lakes, you see can see the water oscillate from side to side. What causes these seiches?

Seiche are caused by harmonic resonance brought on by wind, barometric pressure or seismic events.