Q&A: Why is Sleep Important?

Sleep is key to our survival and well-being, but the exact reasons for its existence are unclear. Much research focuses on the synaptic homeostasis hypothesis, a proposed mechanism that balances synaptic growth and shrinkage to prevent brain damage and support learning.

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Q&A: Why Do Killer Whales Go Through Menopause?

Why do some species, including humans and killer whales, stop reproducing long before the end of their lives? A new study from Exeter University suggests that older females may gain adaptive advantages by helping to raise their daughters’ calves instead of raising their own.

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Q&A: CO2 Past the Point of No Return?

Climate change has begun, and there’s evidence to prove it. Around the world scientists have recorded atmospheric CO2 above 400 parts per million, a level defined as the ceiling for safe CO2 concentrations.

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