In 2012 — when he was just 18 — Dutch inventor and entrepreneur Boyan Slat gave his first TEDx Talk about cleaning up the ocean .

In his talk, he laid out his idea for cleaning up the Great Pacific Garbage Patch, an enormous and still-growing island of plastic and other trash hanging out in the north Pacific ocean between California and Hawaii.

The Great Pacific Garbage Patch was first discovered in 1997 by sailor and ocean researcher Charles Moore when he was participating in the Transpacific Yacht Race.

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When I found out I was pregnant in October 2018, I had planned to keep the news a secret from family for a little while — but my phone seemed to have other ideas.

Within just a few hours of finding out the news, I was being bombarded with ads for baby gear, baby clothes and diapers on Facebook, Instagram and pretty much any other site I visited — be it my phone or on my computer.

Good thing my family wasn't looking over my shoulder while I was on my phone or my secret would have been ruined.

I'm certainly not alone in feeling like online ads can read your mind.

When I started asking around, it seemed like everyone had their own similar story: Brian Kelleher told me that when he and his wife met, they started getting ads for wedding rings and bridal shops within just a few weeks. Tech blogger Snezhina Piskov told me that she started getting ads for pocket projectors after discussing them in Messenger with her colleagues. Meanwhile Lauren Foley, a writer, told me she started getting ads for Happy Socks after seeing one of their shops when she got off the bus one day.

When online advertising seems to know us this well, it begs the question: are our phones listening to us?

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