Simplify the following text for a Grade 10 native English-speaking person.
Original: On Earth , nuclear reactions initiated by radioactive decay produce nucleogenic isotopes rather than the radiogenic daughter isotopes of simple decay . Unlike radioactive decay , nuclear reactions can be employed artificially to obtain nuclear energy , at an adjustable rate , on demand .
Simplified: Other than radioactive decay , there are very few nuclear reactions that occur outside of these special places on earth .