When your 3.5 year-old is talking a mile a minute and the words you catch are "heliophysics... Hydrogen, Neon... and winds of 52,000 miles an hour.". You have no idea what he is talking about until your spouse later mentions a book they read aloud over a month ago that was targeted toward college students. (I know what heliophysics is, but it is so far outside my area of expertise that I was baffled to hear my son explaining his new passion.). You do not find it strange that they chose that to read...

Later in the morning, this child is counting by 15s for fun...

You feel woefully inadequate to homeschool but realize that the local preschool may not be the best fit...