I have you loud and clear.

Hello.

Hello.

Welcome.

Science.

And that is the same physics medicine, nature, or space,, a brain, life, the universe.

Hello.

This week we're taking a look at the industry that transports 90% of global trade, but most of us know very little about.

That's right we're all at sea in the secret world of shipping.

Plus how testosterone hardens your arteries are drones getting out of control and can a spoon in the

bottle stop your sparkling wine going flat. I'm Chris Smith and I'm Katani and this is the Naked Scientists.

The Naked Scientists Podcast is powered by UKfast.co.uk. Okay.

First up, heart disease causes one in three deaths worldwide.

It's caused when arteries supply blood to the heart

become narrowed and stiffened and men seem to be particularly vulnerable to this.

Now new research suggests that the male hormone testosterone might be partly to blame

by transforming the muscle cells that are found normally in the walls of arteries

into bone cells which build up calcium and then stiffen the tissue.

Vicky McCray led the new study which was carried out at the University of Edinburgh.

So this study shows that testosterone, which is one of the main hormones in men can act on blood vessels and heart

valves in the heart to increase the hardening of this tissue and this is

important because the hardening of the tissue can be linked to the increased likelihood of a

...