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90.3

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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90.2

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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90.1

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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89.2

Q&A: How Many Stars Are There in The Universe?

Astronomers estimate that there are billions of stars in the universe, but are their numbers accurate? With increasingly sophisticated imaging technology, scientists are continuously improving their approximations.

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