The greenhouse effect occurs when Earth's atmosphere traps solar radiation because of the presence of certain gases, which causes temperatures to rise.
HowStuffWorks "Moon Phases". I like that it actually shows the Sun's shadow so students can understand how this works!
Famous Quotes 21
Tips and Hacks for Everyday Life: What can I learn right now in just 10 minutes that could be useful for the rest of my life? - Quora
Shutter Speed Cheat Sheet ~ by @capturebylucy
Interesting to see how your brain is broken down...
The 2014 Gold Series (Part 1 of 5): The Most Sought After Metal on Earth
Exposure Tutorial Part Three: What is ISO?
How to take better holiday photographs (via Visual.ly).