Joe Rogan Experience #2580 - Kenneth Lacovera

Scientific Evidence for Dinosaurs [0:01:28]

• Paleontology is a science of prediction and testing, not a belief system.
• Skepticism is healthy, but a global conspiracy to fake dinosaur existence across continents and eras is impossible to scale.

• Science isn't a belief system, right? Right. Go outside and dig up some fossils for yourself.

The Calendar of Earth History [0:04:47]

• If Earth's history were one year, complex life starts at Thanksgiving.
• Dinosaurs appear in the second week of December and are wiped out the day after Christmas.
• Humans appear only 20 seconds before midnight on New Year's Eve.

• And dinosaurs were just here. It's only 2% of earth history ago.

The Rarity of Fossilization [0:06:54]

• Most organisms decay; becoming a fossil is an unlikely event that only happens when repeated over vast time scales.
• Mountains are erosional, so dinosaurs living there rarely enter the fossil record.

• Unlikely things are likely to happen when happening happens a lot.

Original Bone and Soft Tissue [0:08:44]

• Mineralization (per-mineralization) replaces bone with minerals, but original soft tissue can occasionally be preserved.
• Claims of dinosaur blood cells remain a subject of active scientific debate and rigorous validation.

• Science has discovered trace of dinosaur blood preserved for 115 million years, shattering assumptions about how long biological molecules can survive.

The First Dinosaur Discoveries [0:13:30]

• Early discoveries in 19th-century Britain were named by Richard Owen, who misunderstood them as giant lizards.
• Folklore often attributed fossil findings to dragons or mythical creatures due to a lack of knowledge about deep time.

• People do what people do, which is we make stuff up.

Hadrosaurus and New Jersey [0:16:15]

• The first nearly complete dinosaur skeleton was discovered in Haddonfield, New Jersey, in 1858.
• This discovery sparked "dinomania" and established New Jersey as a cradle of American paleontology.

• England is the birthplace of dinosaur paleontology, but southern New Jersey is the cradle of dinosaur paleontology.

Reconstructing Dinosaurs [0:18:02]

• Artists use modern analogs, like hippos or birds, to guess how dinosaurs looked, acknowledging that color and soft tissue remain uncertain.
• Leonardo, a duck-billed dinosaur, provided rare 3D insights into skin texture and gut contents.

• There's a lot we don't know about dinosaurs, but that's what keeps us in business, right?

Feathered Dinosaurs [0:21:40]

• Theropod dinosaurs, including T-Rex and Velociraptors, likely possessed feathers or feather-like structures.
• Velociraptors in reality were much smaller than their Hollywood counterparts, closer to the size of a turkey.

• In the case of velociraptor, we can actually see the quill insertion knobs on its ulna.

The Massive Dreadnoughtus [0:26:15]

• Dreadnoughtus is one of the most massive dinosaurs for which scientists can confidently calculate weight (65 tons).
• Bone tissue analysis shows Dreadnoughtus was still growing rapidly at the time of its death.

• You could probably fit, you know, two Dreadnoughtus brains in a pint glass.

Giant Crocodiles [0:30:25]

• Prehistoric crocodiles like Sarcosuchus and Deinosuchus reached sizes up to 35 feet and likely preyed on dinosaurs.
• Crocodiles exhibit indeterminate growth, meaning they can continue to grow throughout their long lives.

• Crocodiles, who are the closest living relatives to dinosaurs, right? They're not dinosaurs. They're cousins.

The Asteroid Impact [0:37:35]

• The 66-million-year-old asteroid impact caused global temperatures to spike to oven-like levels.
• Non-avian dinosaurs were functionally extinct within a day because they lacked the ability to burrow or hide.

• If you were here the day before that asteroid hit, you would look around and you would say, well, this is how it's always going to be.

Geological Laws [0:43:08]

• Nicholas Steno established the fundamental laws of geology, including that the oldest layers are at the bottom.
• James Hutton later proved the Earth was ancient by observing geological cycles at Siccar Point.

• The Earth shows no vestige of a beginning, no prospect of an end.

Plate Tectonics [0:50:00]

• The theory of plate tectonics, established in the 1960s, explains how continents move via seafloor spreading.
• Magnetometers revealed magnetic stripes on the ocean floor, proving the Earth's magnetic field periodically flips.

• It's almost like the discovery of DNA in biology. Like plate tectonics in geology just kind of makes everything make sense.

The Bone Wars [1:01:25]

• Cope and Marsh engaged in a bitter, unethical rivalry to name the most dinosaur species in the late 19th century.
• Despite their personal failings, their massive fossil collections remain essential to modern paleontology.

• Cope challenged Marsh. He said, you know, when we die, let's donate our brains to science and see who has the bigger brain.

Museum Reconstructions [1:05:40]

• Museums often use replicas for large skeletons to protect original bones and allow for easier scientific study.
• Best practices involve coloring replicas differently so the public can distinguish them from real fossil material.

• It's not great to mount the bones of a big creature because two things. One is that you have to do things to the bone.

Future Prospecting [1:07:30]

• Antarctica remains a prime, largely unexplored location for finding new dinosaur species from the Cretaceous period.
• North Africa's Tethys Seaway is another high-priority region for discovering unique aquatic and coastal dinosaurs.

• There's got to be thousands and thousands of dinosaurs and new species under that ice cap, and we have no idea what's down there.