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This is Scientific American's 60 Second Science.

I'm Christopher in Taliatta.

It sounds like a witch's recipe.

Gather the hearts of a fence lizard, a little brown bat, a naked-tailed armadillo, and dozens of others.

So initially we tried to get them from zoo, but unfortunately, that didn't work out very well.

We couldn't get any samples. Even when the animal

die, we couldn't get heart.

Guo Huang, a developmental biologist at the University of California, San Francisco. He says

they had more success obtaining specimens from the jars of natural history museums. But the reason

for this biological scavenger hunt, Huang and his colleagues wanted to examine the number of chromosomes

contained in heart cells across the animal kingdom.

Because there's a curious phenomenon in our hearts,

which is that most of the human body's cells are diploid,

meaning two sets of chromosomes, one from each parent,

but the lion's share of our heart cells are actually polyploid, meaning two

...