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- Learning from past presidents in moments of crisis
- Learning the stories of Africa
- Let's have a deeper discussion on aid
- Let's look for life in the outer solar system
- Let's take a new look at African aid
- Let's take a nuclear-powered rocket to Saturn
- Leveraging big ideas to make change
- Lewis Pugh swims the North Pole
- Life at 30,000 feet
- Life on Mars? Let's look in the caves
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- Magical improv from 14-year-old pianist
- Making a computer that works like the brain
- Making art of New York's urban ruins
- Making movies that make change
- Marc Koska: 1.3m reasons to re-invent the syringe
- Marcus du Sautoy: Symmetry, reality's riddle
- Mary Roach: 10 things you didn't know about orgasm
- Mathieu Lehanneur demos science-inspired design
- Matthew White gives the euphonium a new voice
- Measuring the fastest animal on earth
- Memes and "temes"
- Michael Pritchard's water filter turns filthy water drinkable
- Michelle Obama's plea for education
- Military robots and the future of war
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- Nancy Etcoff on the surprising science of happiness
- Nandan Nilekani's ideas for India's future
- Natasha Tsakos' multimedia theatrical adventure
- Naturally 7 beatboxes a whole band
- Nature vs. humans, and what we can do about it
- New insights on poverty and life around the world
- New prosthetic arm for veterans
- New thinking on the climate crisis
- Nice building. Then what?
- Nick Sears demos the Orb
