My six-year-old son asked me a question I'm stumped by (one of many). He asked "Why are there different colors?" I half-attempted an explanation about light wavelengths and light reflecting off surfaces and soon realized I was a) over his head and b) over my own head. How would you explain the concept of color--of what color really is--to a six-year-old? Obviously very simple language is needed here.
Are there types of laser light, color or wavelength, whole beam can be seen in daylight conditions with a special eyeglass filter? [more inside]
Does light have magnetism?
Does light (like heat) seep and weaken? [more inside]
What would happen if you could create a perfect two-way mirror into a sphere? [more inside]
Gravity/Life/SocietyFilter: So the Earth is all lumpy, with more or less gravity in some places. Has anyone ever corroborated it with life/social/world things? Many questions inside... [more inside]