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What’s the difference between sperm and semen?

And can pre-ejaculate get you pregnant?

Trump has ‘chronic venous insufficiency’. Is it dangerous? Can it be treated?

Is it okay to boil water more than once, or should you empty the kettle every time?

Bringing water to a boil disinfects it, but you may have heard that boiling it more than once somehow makes the water harmful

Where do giant volcanic eruptions come from? New study finds missing link to ‘blobs’ deep within Earth

Pillars of hot rock connect moving BLOBS in the deep Earth to giant volcanic eruptions at its surface

A lost woman looks for purpose in a Guatemalan lakeside town

In The Sun Was Electric Light, Ruth arrives at Lake Atitlán a loner-searcher. But the people she meets are crucial to her struggles with the question of how to live

Rare wooden tools from Stone Age China reveal plant-based lifestyle of ancient lakeside humans

300,000-year-old wooden tools found in southwestern China reveal surprising sophistication from the ancestors of modern humans