At the 10th half-life, the number of undecayed radioactive nuclei in a sample would have dropped to (1/2)10 = 1/1024 of the original number.
In this comic, the sole survivor of 1024 siblings celebrates his 10th half-life alone. So sad.
* Do realize that for actual radioactive decay, the number of nuclei must be large in order for the decay rate to adhere to the exponential decay function. Also, radioactivity is random in nature so not exactly half will always decay in exactly one half-life.