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• Can anyone tell what my avatar is?

  Asked by Berserker | 41 responses

• Do we see only that light which hits our pupils?

  Asked by Mariah | 9 responses

• Can I put a 26 Watt energy saver (Equivalent to 100W) in a 60 Watt max lamp?

  Asked by athenasgriffin | 6 responses

• What can be done about light pollution?

  Asked by HollyF | 35 responses

• Why at night do bright lights seem out of sync with everything else?

  Asked by XOIIO from iPhone | 2 responses

• What's you best memory from when you saw a sunrise ?

  Asked by Hibernate | 29 responses

• What are the best glow in the dark materials?

  Asked by Ltryptophan | 7 responses

• Can I get my Sony DSC-H20 to take pictures that look as good as a DSLR?

  Asked by Ltryptophan | 1 response

• Have you seen the green flash?

  Asked by Sunny2 | 20 responses

• Vision: Do you see grainy images especially when you look into dark or is my vision faulty?

  Asked by krrazypassions | 10 responses

• Can any sound based imaging device see in color, and if so how does that work?

  Asked by Ltryptophan | 6 responses

• Is it possible to make a time machine? If yes, how? If no, why?

  Asked by krrazypassions | 34 responses

• What are the OBSERVED differences between electric and magnetic fields?

  Asked by s321scba | 18 responses

• Is Einsteinian relativity congruent with thermodynamics?

  Asked by s321scba | 3 responses

• For setting circadian rhythm, what defines "blue light"?

  Asked by pallen123 | 5 responses

• I need help to set up a frog enclosure?

  Asked by ctimm15 | 6 responses

• What objects can I use to light a match?

  Asked by Anatelostaxus | 11 responses

• How do I adjust the contrast of the images that my digital SLR takes?

  Asked by TexasDude | 6 responses

• Which polar end is the least healthy body type for women?

  Asked by Hypocrisy_Central | 15 responses

• What effect does only distance travelled have on light?

  Asked by Ltryptophan | 14 responses

• Are there any plans that use mirrors to light up the inside of a house with sunlight?

  Asked by Ltryptophan | 9 responses

• What is light exactly?

  Asked by Hypocrisy_Central | 22 responses

• If you are sealed into a sphere with a highly mirrored interior and you turn on a flashlight and then turn it off will the interior stay lit up?

  Asked by Ltryptophan from iPhone | 13 responses

• Why can't we see our bones (like we can our veins) when a flashlight is held against a hand?

  Asked by DrasticDreamer | 8 responses

• How can you revert an upside-down image in a camera obscura?

  Asked by Carly | 10 responses

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