• The eruption that caused a mini ice age in the 6th century AD was somewhere in the northern hemisphere (31 August, p 14).
• Waggle room: male drone bees have only one set of chromosomes (17 August, p 38).
• Ouch. Many gallstones are composed of cholesterol and crystals of calcium compounds (24 August, p 17).
• Glowing reference: coral absorbs short-wavelength light and re-emits it at a safer, longer wavelength (24 August, p 8).
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