If you missed them on TV, you can still catch the 2025 Christmas Lectures (supported by @cgi_uk ) on demand!
📺 If you're in the UK, watch on BBC iPlayer
🌎 From outside the UK, find them on YouTube
And for even more Christmas Lectures, explore our archive with series going back to the 1960s, all free to watch from anywhere.
All links are pinned to our story highlights: @ri_science
The Ri is for life, not just for Christmas (Lectures) 🎁
We're here all year-round, giving everyone opportunities to explore science and the fascinating world around us—both in person and online.
Follow @ri_science to stay with us in 2026!
If matter and antimatter had existed in perfectly equal amounts after the Big Bang, our universe would be nothing but light. 💫
Watch the full talk with Tara Shears at the l ink on our profile: @ri_science
What has more genes: a banana or a human being? 🍌🧍 The answer might surprise you!
Philip Ball reveals how life is a far richer, more ingenious affair than we had guessed.
Watch the full talk at the l ink on our profile: @ri_science
With Ri Membership, enjoy free or discounted lecture tickets, exclusive events, and a year of fascinating ideas.
Tap the l ink on our profile to discover all the benefits and explore Membership for adults, young people and families: @ri_science
Why do Jubilee line trains on the London Underground make that distinctive sound? 🚇
Next time you hop on a Jubilee line train, stop by the Ri—we're just a five-minute walk from Green Park!
Can you help us find the missing Christmas Lectures? 📼
31 episodes of the Christmas Lectures broadcast between 1966 and 1973 are missing, presumed "wiped" by the BBC. This includes one of Sir David Attenborough's lectures, not seen since it was first broadcast live over 50 years ago.
We believe copies may exist somewhere, made during the earliest days of video recorders.
Tap the l ink on our profile to see how you can help: @ri_science
Sir David Attenborough's 1973 Christmas Lectures broke the cardinal rule of broadcast television: "never work with animals or children"—and because of that, they gave us some truly magical moments, like this interaction with a ring-tailed lemur.
Continue celebrating Sir David's 100th birthday with us by watching the series. Tap the l ink on our profile to watch for free on our archive: @ri_science
Happy 100th birthday to national treasure, Sir David Attenborough! 🎂
To mark this fantastic milestone birthday, we rounded up all the animals he brought to his 1973 Christmas Lectures to create a Countdown-style maths challenge you can also play from home.
Watch Sir David's Christmas Lectures at the l ink on our profile: @ri_science
Liquid oxygen has paramagnetic properties 🧲
When you pour it between two poles of a strong magnet (at room temperature) the liquid is held there until it boils back into a gas.
As jellyfish move, they generate vortices in patterns that also appear in the human heart. 🪼
Healthcare Engineer Becky Shipley illustrates how simple models can lead to life-changing insights.
Watch the full talk at the l ink on our profile: @ri_science
