It has 15 different known isotopes, including carbon-13 and carbon-14. Carbon-13 makes up about 1% of all carbon atoms on Earth, while carbon-14 is used in radiocarbon dating because it decays into nitrogen-14 with a half-life of 5730 years.
Diffusion things go from high to low concentration so if there's more sugar inside the potato water will go in because there's less water inside than outside.
