Sperm's lifespan. It takes around 10 weeks for the sperm to reach maturity. Once the sperm is inside the woman's body it can live up to 5 days or even longer under favorable conditions. However, when it is outside the body, it can only survive from few minutes to several hours.
The UX developer role is a discipline under the overall user experience umbrella. This means that to become a UX developer you need to have at least a general understanding of the core UX principles, philosophies, and methodologies.
In computing, a user agent is software (a software agent) that is acting on behalf of a user. One common use of the term refers to a web browser telling a web site information about the browser and operating system. This allows the web site to customize content for the capabilities of a particular device, but also raises privacy issues.