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The nature documentary series Our Planet opens with a startlingly stark observation courtesy of broadcaster, biologist, natural historian, and author Sir David Attenborough: Just 50 years ago, we finally ventured to the moon… Since then, the human population has more than doubled… (and) In the last 50 years, wildlife populations have, on average, declined by […]

?si=pnmakCdYBQ6dTM0T From the Royal Society comes a short primer on snowflakes. Narrated by physicist Brian Cox, the video explains how they form, and why no two snowflakes have the exact same dimensions. It also recounts how Johannes Kepler developed a groundbreaking theory about the hexagonal shape of snowflakes in 1611–one proved right 400 years later. […]