676K views · 3.2K reactions | A rare visual phenomenon known as the 'Tyndall Effect' was spotted outside a skyscraper in northern China. The effect occurs when a beam of light is ‘scattered’ by particles of matter in its path—in this case, smog. | NowThis | Facebook

7.4K views · 199 reactions | In the 1800s, Irish physicist John Tyndall discovered that some atmospheric gases absorb infrared radiation.  This helped scientists later understand how heat is trapped by the Earth’s atmosphere—the basis of what we now call the greenhouse effect. Greenhouse gases are essential for us to live on our planet, but we're now experiencing "too much of a good thing". | Royal Institution of Great Britain | Facebook