0:00 I was going through a collection of old scientific papers...0:10 a first edition of Becquerel's work from 1903.0:18 And a single folded page fell out.0:24 It's brittle.0:27 The ink is faded.0:30 But the handwriting is unmistakable.0:36 It’s dated July eighteenth, 1898.0:42 I think...0:44 I think I'm holding a lost diary entry.0:50 From Marie Curie.0:53 On the day she announced the discovery of a new element.1:03 I have to read this.1:07 July eighteenth, 1898.1:11 It is done.1:13 Today, Pierre and I presented our paper to the Academy.1:22 We have proposed a new element.1:28 Polonium.1:29 Named for my Poland...1:33 a country that exists in my heart even if it does not exist on a map.1:46 The work is announced.1:49 But my mind is still in the shed.1:55 I can still smell the pine smoke and the acid.2:03 I can feel the dust of the pitchblende in my lungs.2:12 Eight tons of it.2:15 We have boiled and filtered and crystallized for months, in the heat of this Parisian summer, in a room with a leaking glass roof.2:38 My hands are raw.2:41 My back aches.2:44 Some nights, I wake up and believe I am still stirring a bubbling cauldron with an iron rod as big as myself.3:03 Pierre is...3:05 incandescent.3:08 He sees the physics, the new world of the atom we are beginning to glimpse.3:21 I see that too.3:23 But tonight, I am thinking of the other thing.3:32 Not Polonium.3:34 The other one.3:36 The substance that remains in the residue.3:44 The one that is so much more active.3:50 The one whose salts...3:54 they glow in the dark.3:58 A faint, beautiful, ghostly blue light.4:05 We have no name for it yet.4:10 But it calls to me.4:13 It feels like a secret whispered from the universe itself.4:23 We have opened a door, and we have no idea what lies on the other side.4:36 We only know that the world is not as we thought it was yesterday.4:47 And that is enough.4:51 For now, it is everything.4:55 To hold this...4:58 it feels like touching history.5:04 She wrote this before the Nobel prizes, before the fame, before the word "radioactivity" was known to the world.5:23 It was just her, Pierre, and a shed full of poisonous ore that they were slowly, painstakingly breaking down by hand.5:44 The pattern here is as old as discovery itself.5:52 The thing that illuminates is also the thing that burns.6:02 Radium would go on to save lives, to power a new age of medicine and physics.6:16 But the notebooks she filled with her data became so radioactive they are still kept in lead-lined boxes.6:34 The faint, beautiful light she wrote about...6:42 it was killing her.6:46 The energy she had discovered was unraveling her own cells.6:56 We see this same shape again and again.7:03 The test pilot who flies the experimental plane.7:11 The doctor who injects themselves with a trial vaccine.7:21 The first explorer always assumes the greatest risk.7:30 Marie Curie didn't just discover a new element.7:39 She became the first human data point on its lethal power.7:49 Progress is often paid for in the currency of a single, dedicated life.