Why can’t we remember being a baby?

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<p>The Astronomical Balloon "How far up can a helium balloon go? Could it go out to space?" asks Juliet Gok, aged 9. This calls for an experiment! Dr Keri Nicholl helps Adam launch a party balloon and track its ascent. But their test doesn't quite go to plan. Meanwhile, Hannah discovers where space begins by asking Public Astronomer Dr Marek Kukula, from the Royal Observatory Greenwich. Send your Curious Cases to the team: <a href="mailto:curiouscases@bbc.co.uk">curiouscases@bbc.co.uk</a></p><p>The Forgetful Child "Why don't we remember the first few years of our lives?" asks David Foulger from Cheltenham. The team investigate the phenomenon of 'infant amnesia' with Catherine Loveday from the University of Westminster. 40% of us claim to remember being under two years old and 18% recall being babies. But can we really trust these early memories? Martin Conway from City University thinks not.</p><p>Picture: Baby Foot, Credit H. Armstrong Roberts/Retrofile/Hulton Archive/Getty Images</p><p>Producer: Michelle Martin.</p>