How Science Defines A Year

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[music] It's my birthday!

[cheering] It's been a year since we uploaded the very first video to It's Okay To Be Smart, and a lot has happened in the meantime.

I got a PhD, I met Bill Nye, I even Neil deGrasse Tyson, I uploaded 2 hours, twenty two hours and twenty two hours of video and I made a lot of new YouTube friends in the process.

I even beat Derek from Veritasium in an epic YouTube arm-wrestling match.

A lot can happen in a year, yet it can seem like no time has passed at all.

Time's weird like that, it's kind of like a river, the past keeps floating away behind us, and the future keeps rushing towards us, yet we're stuck here paddling our little boats in the moment we call now.

Except as it flows by, each of those nows becomes a then, you can never quite grab on to them.

Instead we must mark our journey with mileposts of our own invention, seconds minutes, hours, days, weeks, months, and years.

How do you measure a year?

In daylights, in sunsets, in midnights, or cups of coffee?

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