Orangutan mothers plan play dates for their offspring, according to 15 years of behavioral and movement data from 31 Bornean orangutan mother–child pairs. The generally solitary apes expend energy to take their offspring to visit similarly aged peers. In PNAS: https://ow.ly/mwlb50ZZoiu

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A liquid stream flows horizontally through midair inside a tube made of ultrasound. No solid walls touch it, and the channel can be redirected on the fly.

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#SundialSunday 🔭 🧪 #astrohistory How to draw a reflection #sundial on a corridor. From Emmanuel Maignan's 'Perspectiva Horaria' (1648).

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Hey, we should talk more about this goal 😮‍💨

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The number of wars that haven’t happened in my lifetime (and for which, therefore, I must be credited) is beyond counting. And yet [looks at empty hands] still no prize.

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