Death

Number of deaths in America in 2014 (1 pixel represents 1 death). 
At least it does in the original graphic, but this one has been scaled down by a factor of 4, 
which means each pixel represents 16 deaths.

Found this on graphical representation, which is a pro-gun blog. I think it gives a good picture of what's killing us, except it doesn't include automobile accidents or opioid overdoses or soldiers killed in combat, so lets see how big those are:

• opioid deaths:      47,055
• automobile deaths:  32,675
• combat deaths:   maybe 200, hard to tell

If we made a block at the same scale to cover these, that block would be this big:

Scaled block for other deaths.

I should have made a new block for these three categories, but I'm lazy, so I just scaled the other one down.