Leaves have many different jobs: photosynthesis, gas exchange, water exchange, and more.  But how do they end up in the shapes that they are?  Joining Jonathan to discuss is Dr Katie Gray Ferris, Assistant Professor in the Department of Ecology and Evolutionary Biology at Tulane University in the United States.

Futureproof Extra: How leaves form their shapes

Jonathan responds to your texts and tweets, is joined in studio for all the latest science stories for Newsround and speaks to one of our two guests featured on the show.

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Science

John Krakauer - Professor of Neurology and Neuroscience, and Director of the Center for the Study of Motor Learning and Brain Repair at Johns Hopkins

The Video Game that Aids Stroke Recovery

Fabian Klenner is a Postdoctoral Researcher at the University of Washington

Extra: Could Europa Clipper Detect Life on Jupiter's Moon?

Jules Howard - Zoological Correspondent and Author of Infinite Life: A Revolutionary Story of Eggs, Evolution and Life on Earth

The Evolution of Eggs!

John Whitfield is a Science journalist and Author

Extra: Ant Supercolonies

Professor Arun Misra is a Thomas Workman Emeritus Professor in Mechanical Engineering at McGill University.

Futureproof Extra: How leaves form their shapes

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