Cats are beloved family members in tens of millions of households, but we know surprisingly little about their genes.

Being able to ascertain the genetic root of a rare disease has caused a boom in research into gene therapies, which has seen three significant approvals for rare diseases in recent years ...

However, a growing number of studies have suggested that kids growing up in a home with "furred animals" -- whether it's a pet cat or dog ... the red flag for heart disease, says Justice.