Lost Worlds: Aliens from Earth?

More than just beautiful flowers, wild orchids have been confounding scientists for years. Our friends at Sidedoor — a podcast from the Smithsonian — set out to find a rare specimen for themselves. Guest: ⁠Lizzie Peabody⁠, host of ⁠Sidedoor⁠ For show transcripts, go to ⁠⁠⁠⁠⁠⁠⁠⁠⁠⁠ ...  Show more

The past few months have been full of Alzheimer's optimism: new ideas that could prevent the disease from taking hold, medications that seem to slow it down, and an experimental surgery that might even be able to reverse its progression. It's a lot of hype. Should we believe it? ...  Show more

Do you believe that life exists on other planets? Well, here's an even more mysterious idea: Have you ever considered that there might have been another civilisation with advanced technology on planet Earth... before humans? Beth and Phil discuss this and teach you some new vocab ...  Show more

If an advanced civilization existed on earth several million years ago, would we actually be able to detect that they were here? It may sound like conspiracy theorist bait, but a serious and balanced look at the question reveals a lot about geology, climate and the search for ali ...  Show more

How likely is it that we’ll find intelligent alien life on other planets? Are there extraterrestrial civilizations that we could contact - or that could contact us? And what would these aliens be like? We’re going to try to answer these big questions with the help of two scientis ...  Show more

As far as we know life evolved once in the universe – here on Earth in the form of life as we know it. Could life have originated in other conditions with different raw materials? If so, we may be sharing the planet with lifeforms we don’t recognize yet.See omnystudio.com/listene ...  Show more