"How the Other Half Lives" by Jacob Riis was originally published in 1890. It offered a stark portrayal of the living conditions of immigrants and the poor in New York City during the late 19th century, using both text and photographs to bring attention to the struggles of these marginalized communities.
Jacob Riis, in 1890
it was published in December of 1889
Jacob Riis
Answer this question… Safe.
Dangerous
1/16 of the original sample of any unstable element remains after 4 half lives.
75%
The half life of thorium-232 is 1,405(6).10e10 years.
it depends on where it came from, and how old it is.
A half-life is the amount of time it takes for half of the material to decay. So if you started with 80g After 1 half-life you would have 40 g After 2 half-lives you would have 20 g After three half-lives you would have 10 g
Today, about half of all Americans live in suburbs.
2.66666666666667 grams
By observing how much decays in a few days, or in a year, and extrapolating.
1.875g
2.5