Cognition

zoology

Humans are animals, yet we often think and talk about animals as if they are fundamentally different from us. This evergreen explainer compares humans and other animals across b...

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health-and-wellbeing

Age effects refer to changes in physical health, cognition, emotion, and behavior that are associated with progressing through different life stages. These effects are shaped by...

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health

Sildenafil, sold as Viagra for erectile dysfunction, works by boosting blood flow by blocking PDE5, an enzyme that regulates blood vessel dilation. Because PDE5 is present in th...

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