This article appears in the August 2025 print edition with the headline “The New Arms Race.” ...

Dolphins, meanwhile, may have the biggest mammalian testicles of all, making up as much as 4 per cent of their body weight (equivalent to human testicles weighing roughly 3 kilos).

Human testicles are much smaller, in proportion, to some of our primate cousins. Evolution can tell us why. But the size of other body parts is a little bit more of a mystery.

Meanwhile, tissues in other parts of the body don't get enough oxygen, causing muscle pain that shoots from the chest to the arms, and then to the shoulders, jaw, neck or back.

Stress triggers the body’s fight-or-flight response. Chronic stress can cause negative health effects on your mood, immune and digestive systems, and cardiovascular health. You’re sitting in ...

It’s important to maintain a healthy diet when experiencing depression. Nutrients are essential to making sure the body’s neurotransmitters are firing right.

In computer vision, classification of human body parts faces challenges such as partial occlusion of body parts, viewpoint variation, lightning and appearance changes, etc. In this paper in an outdoor ...

The second in a 7-part series in which Robert Winston looks in detail at the life of the human body in chronological order from birth to death. This part is about the start of life. Philipa and Geoff ...

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