When a heart attack strikes, time is of the essence. In this episode of the 'Big Questions' podcast, Dr Tingting Zhu explains how she is using a machine learning algorithm, trained on 15,000 ECGs, to diagnose heart attacks faster.

Don't think of your body as a mechanical structure? Think again! It's a feat of meticulous engineering...

In this special Valentine's edition of the Big Questions podcast, we're diving into the world of online dating...

Oceans cover more than 70% of the Earth's surface, yet only 15% of the ocean floor has been mapped in detail. Much remains unknown, including the location of potentially hundreds of thousands of seamounts (underwater mountains), which can be hazardous to navigation. Scientists at the University of Oxford are working with others to compile the most comprehensive analysis of the ocean floor yet.

Many ground-breaking astronomical discoveries rest on her shoulders, but who was Henrietta Leavitt? We chat to Dr Becky Smethurst about this 'hidden woman' of astronomy...

The placenta is a fascinating organ, which allows communication between mother and foetus through the release of bubble-like vesicles. Could the messages within these vesicles provide an early warning of diseases such as gestational diabetes and preeclampsia?

Why exactly do we age? Do different species age at different rates, and - time for the Big Question - can we STOP ageing?

When it comes to sensing potentially-dangerous vapours, sniffer dogs are still considered the gold standard. In this animation we learn about chemiresistive sensors, a new type of sensor that may be able to match the noses of our furry friends...

Happy New Year! If you've made a new year's resolution to lose weight or have a healthier lifestyle in 2020, then this episode of the Big Questions podcast is for you!