大象传媒

Iran鈥檚 nuclear programme is at the centre of a political row, with the country suggesting it could increase uranium production to above the levels permitted under an international agreement. We look beyond the rhetoric, discuss Iran鈥檚 covert history of nuclear development and ask scientifically what this latest move involves.

Fish are no respecter of international borders and when it comes to spawning, research reveals up to $10bn worth of potential fish stocks move between different political territories.

Ancient trees in the Eastern US are yielding clues to the climate going back more than 2000 years, they reveal there has been more rain recently.

Breathing is automatic: awake or asleep, running or resting, our bodies unconsciously make sure we get enough oxygen to function. But - unlike other bodily functions such as heart rate and digestion - it鈥檚 not hard to control our breathing consciously. If you鈥檝e ever been to an exercise, meditation or yoga class, you鈥檙e probably familiar with instructions about how and when to breathe.

Sports scientist Mitch Lomax takes us through the biology, chemistry and physics of breathing, and shows us how to train our respiratory muscles. We meet yoga guru Hansa Yogendra in India, where the study of pranayama - literally 鈥渂reath control鈥� in Sanskrit - is thousands of years old; and find out what scientists have discovered about the effects of these ancient techniques on the body and mind.

(Photo: President Hassan Rouhani and the head of Iran nuclear technology organization Ali Akbar Salehi inspecting nuclear technology. Credit: Office of Islamic Republic President via EPA)