How would our tech development have gone if glass wasn’t transparent?
Readers point to other clear materials that could be used instead of glass, from plastics to crystals, though they bring new challenges
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This week’s new questions
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Tom Gauld on giving credit where it’s due
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Life
Remarkable photos highlight the haunting resilience of nature
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Twisteddoodles on a cunning new strategy to avoid extinction
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Space
Already know the Big Dipper? There’s more to this group of stars
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Could two negatively charged black holes repel each other?
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How long would it take to speed up to 99 per cent light speed? Part 2
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This week’s new questions
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Comment
Who needs Eurovision when we have the Dance Your PhD contest?
As Eurovision looms, Feedback enjoys discovering more about the winners of this year's Dance Your PhD contest, who have an original take on chemesthesis, the sense that detects the heat of chillies and the coolness of menthol
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Tom Gauld on the joys of a sunny day
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Twisteddoodles on the moon’s awkward emo phase
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Environment
These photos reveal the unique agricultural system of the Maya people
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Mind
Can we get better at spotting when someone is lying?
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