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Diana Marques followed her passion for painting and biology separately until one day she saw an ad for a scientific illustration workshop.

With the latest education reform still under way, the environment for teacher training and employment in Italy remains uncertain.

"You can get encouragement to hostility depending on what we are saying and who we are talking to," says Helen Wallace. A firm belief in the issues you are campaigning for and the ability to stand your ground are vital skills for lobbyists.

"UNESCO considers itself a laboratory of ideas, so you have to be able to anticipate new concepts" and get diverse groups of people to develop a shared vision, says UNESCO professional Meriem Bouamrane.

Every year, IAEA hires 15 to 30 nuclear inspectors, typically in their 30s, many with backgrounds far removed from nuclear physics.

Botanist-turned-teacher Liam Garvey describes his ultimate reward as "when a kid gets it. You see the light of understanding; that's the kick."

Luck will play a big role in whether you become an astronaut, so "don't put all your eggs in one basket," suggests ESA astronaut Reinhold Ewald.

"I enjoy ... making a difference and seeing how much the world of antidoping has developed in the last few years." --Osquel Barroso

The best and most popular stories of 2012, as chosen by readers and editors.

"I would say that there's definitely enough work to go around." --Emma Hitt

As maps have changed, so have mapmakers.

A new crowd-funding platform allows grads to raise money by offering backers a share of their success.