"I walk around the ring but I never take my eyes off my opponent. I keep my eyes on him even if his ready and pumped and can’t wait to get his hands on me as well. I keep my eyes on him. I keep my eyes on him. I keep my eyes on him. Then once I see a chink in his armour. BOOM! His eyes made a move then I know I have him. Then when he comes to the centre of the ring he still looks at me with this piercing look and as if he’s not afraid but he already maybe that mistake when he looked down for that one tenth of a second” - Mike Tyson
At TEDxYouth@Manchester, genetics researcher Dan Davis introduces the audience to compatibility genes — key players in our immune system’s functioning, and the reason why it’s so difficult to transplant organs from person to person: one’s compatibility genes must match another’s for a transplant to take.
(Images from Davis’s talk, Drew Berry’s animations, and the TED-Ed lessons A needle in countless haystacks: Finding habitable worlds - Ariel Anbar and How we conquered the deadly smallpox virus - Simona Zompi)