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Last year, London saw a 40% drop in new HIV infections.

This week, we're finding out why.

Plus in the news, how sea grasses could be a rich source of new antibiotics,

the trick that scientists have learned from spiders about making strong materials and why commuters are buzzing about drones in Dubai.

I'm Katani.

I'm Chris Smith and this is the Naked Scientists.

The Naked Scientists podcast is powered by UKfast.co.uk. For years we have abused the oceans and use them as dumping grounds for

everything from plastics and chemicals to industrial waste and even raw sewage. This is having a devastating and and it's also increasing the odds of humans becoming unwell.

Now scientists have discovered that the sea might have its own solution in the shape of sea grasses,

which come with their own in-built water cleansing system.

From Cornell University, Drew Harville.

Sea grasses are flowering plants, so just like our grasses on land,

they have little flowers and they produce seeds, which then are sexually produced

and start new plants.

They also can clonally produce so vast meadows can spread really quite quickly. Sea grass beds are the base of the food chain in the ocean.

They provide critical nursery area for baby fishes and forage fishes

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