 Goldsmith (2008) proposed that though increasing the generation rate and evolution rate is beneficial for a species, it is also important to limit lifespan so older individuals will not dominate the gene pool.Yang (2013)'s model is also based on the idea that ageing accelerates the accumulation of novel adaptive genes in local populations.However, Yang changed the terminology of "evolvability" into "genetic creativity" throughout his paper to facilitate the understanding of how ageing can have a shorter-term benefit than the word "evolvability" would imply.