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Nine-month-old twin sisters Kalani and Jarani Dean are becoming internet sensations because of a twist of genetics that left them looking like they're not related at all. These two beautiful girls were born in Illinois on April 23, 2016 to parents Whitney Meyer and Tomas Dean. They're biracial—Meyer is white, while Dean is black. And just because of the unique way genes get shuffled around during conception, Jarani wound up with a much darker skin and eye color than Kalani. Meyer posted a photo of the girls on the Facebook page of KQHA 7 News.

Local Quincy Il Biracial Twins!! One is white and one is mix! Really odd and neat!! Just wanted to share with our community!!!

Posted by Whitney Meyer on Monday, January 23, 2017
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The whole internet agrees: that's pretty cool. These healthy little bundles of joy will have a fun conversation starter for the rest of their lives. And their parents love all the attention their babies are getting online.

Like/share us please!! We're chromosome twins . Kalani(on left) is light with blue eyes and Jarani(on right) is the darker one with brown eyes. This is rare but so awesome to share!! How many likes can we get?

Posted by Whitney Meyer on Wednesday, November 2, 2016

Meyer is definitely on to something here. These kids are "like" magnets.

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According to the BBC, biracial twins have about a 1 in 500 chance of being born with significantly different skin tones. Of course, that only applies to fraternal twins, like Kalani and Jarani.

Posted by Whitney Meyer on Monday, January 23, 2017

Meyer told KQHA that she was beyond thrilled the first time she saw her little girls.

At first when they were born, I wanted to believe it but it's so rare I didn't think it'd happen to my twins! But sure enough they're biracial twins!

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And it's not just their appearance that's different. Meyer says that at just nine months old, they clearly have very distinct personalities. Kalani is full of energy and always wants to crawl everywhere, while Jarani loves to eat and couldn't care less about crawling.

Isn't science great? (Mostly just in regards to babies.)

Sources: KQHA 7 News