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Without further ado, this is the naked scientist.

Hello, welcome to the program that brings you the latest breakthroughs in science, technology,

and medicine. I'm Chris Smith.

This week scientists grow beating hearts in a laboratory culture dish, we'll hear how.

Why the plastic you recycle isn't going where you think it is and why a long working week might be the death of you.

Plus, we're tuning into the science of bird song, including parents who talk to their eggs to warn them of high temperatures

and how traffic noise means young birds are

taking longer than they used to to learn new songs. The Naked Scientists

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In a world first, scientists at Vienna's institute of Molecular Biotechnology have managed to grow

miniature hearts from stem cells in a laboratory culture dish.

The key, according to Sasha Menchen, who led the work, is adding the right growth

signals at the right time.

This results in clusters of stem cells organizing themselves into a hollow chamber with an

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