Ronald Reagan had Alzheimer’s while president, says son

Son Ron Reagan's claim that Ronald Reagan had Alzheimer's while in office leads to war of words with half brother Michael

Snowboarding ‘less deadly’ than skiing, study finds

Professor concludes that snowboarders, though more likely to get injured, are a third less likely to die on the slopes than skiers

Flu death toll more than doubles to 112

Health Protection Agency says majority of deaths occurred in December and outbreak may be beginning to plateau

Happiness doesn’t increase with growing wealth of nations, finds study

A survey of developed and developing countries suggests citizens' sense of wellbeing does not rise with increasing wealth

David Lynch tackles post-traumatic stress with transcendental meditation

US combat veterans join Clint Eastwood and Russell Brand in praising technique at launch of Operation Warrior Wellness

Sperm stem cells can be turned into insulin-making cells to treat diabetes

Human sperm stem cells have been transformed into beta-islet cells, which could be used to produce insulin in diabetes patients

The gap in our teeth

DD Guttenplan: It is shocking how much the state of someone's smile still reveals about their class

Alzheimer’s may result from slow clearance of amyloid protein in brain

Brains that are inefficient at removing amyloid protein may be more susceptible to Alzheimer's disease, research suggests

MS could be reversed by activating stem cells in brain, new study suggests

Stem cells have been stimulated to regenerate the myelin sheath that is damaged in multiple sclerosis (MS)

German pupils told to keep chewing as scientists extol virtues of gum

Scepticism surrounds pilot scheme in Bavaria aimed at increasing concentration and encouraging learning