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Hmmm. The vast majority of space object's orbits are stable enough in orbits avoiding us:

1. We wouldn't be here if it weren't the case 2. They would have already collided.

Do we really want to destabilize an otherwise random asteroid's orbit unless it's certain it's on a collision course?

1. There are millions (billions?) of other asteroids that come close to us. What makes this one so special? Deflecting this one, even if the deflection works with no unintended consequences, does nothing to improve our odds against getting hit (P = P_one_asteroid * N_asteroids; N_asteroids - 1 ~ N_asteroids). 2. If the deflection destabilizes the orbit, where will the asteroid go but to a nice heafty attractor ?

The only value of this is if we're certain its on a collision course. But if we are, then it too late to deflect!

To add to your comment in the title "Prehistoric" , "before history", means before the advent of writing, i.e. 5 000 years or so; history originally referring to times that have written records.

"History" itself now refers to the entire Universe timeline before the present. But prehistory cannot mean that, because that would be pre-BigBang.

So the title "Prehistoric babies Drank Animal Milk from Bottles" could refer to 1491 born Guaraní babies drinking Llama's milk from ceramic bottles and a nipple made from the rubber tree. Cool, but of no relevance to a paleo-diet.

I'll add that debt is the integral (well sum) of deficits. deficit/GDP, or deficit/revenue ($4T/$3T = 33%? is that right?) is far more worrying than just the debt/GDP.

However, I will concede that GDP as a measure of productivity is hard to measure, easy to manipulate, and less effective than other measures of productivity.

Look up what ended Japan self-imposed isolation.