A new experiment has demonstrated something that sounds physically impossible – light itself casting a shadow. It turns out that if you manipulate a laser just right, then hit it side-on with another ...
The Talmud (Shabbat 21b) records a famous debate between the Schools of Shammai and Hillel as to how to light the Hanukkah lights. Bet Shammai rules that we should light 8 lights the first night, and ...
Let's Learn is available to stream on pbs.org and the free PBS App, available on iPhone, Apple TV, Android TV, Android smartphones, Amazon Fire TV, Amazon Fire Tablet, Roku, Samsung Smart TV, and ...
This activity is part of the Science Friday Sun Camp collection! For 4.5 billion years, the Sun has generated energy to power the solar system. Visible light is the most obvious form of that energy.
Some results have been hidden because they may be inaccessible to you
Show inaccessible results