How light bends when passing through air then water and can reflect from the surface of water.
The power of curiosity
the power of literacy: https://embed-ssl.ted.com/talks/laura_boushnak_for_these_women_reading_is_a_daring_act.html

Percy the cat
How light bends when passing through air then water and can reflect from the surface of water.
the power of literacy: https://embed-ssl.ted.com/talks/laura_boushnak_for_these_women_reading_is_a_daring_act.html
Percy the cat