Rafe14 said:
What is the reality? can you please elaborate
For people starting an undergraduate science degree, only a very very small percentage ever go all the way and complete a PhD. Compare the size of just
one first year science lecture class with the number of PhD students in the entire faculty. So to say that they choose science because they have a passion for it is misleading. They may start with passion, or what they think is passion, but obviously for a vast majority of them, it fades away at some point or perhaps reality sinks in. If it was real passion, more of them would be in it for the long haul regardless of the circumstances.
A few might complete an honours degree. Depending on what area of science you graduated in, you may get a job as a research assistant (RA) somewhere where most people may work only for a short while before moving on either to a PhD or something or some place else different. RA is generally understood to be a transient role (most RA work contracts are project-specific or only for 1-2 years to be re-newed later if at all), not many people hang around for too long, and for those who stay in it, it's not usually due to being passionate about it, it's just a job that pays the bills. There is no ambition to go any further (not that there's anything wrong with that if that's what you're happy doing).
The rest of the science graduates end up doing something else in life, probably non-science related, maybe further study in another area.
To be able to go all the way to the top in science,
generally speaking, it's a field where you'd need to complete a PhD and then usually a post-doc position or two before you score a good position where you're running your own lab or projects in academia. And at that level, most PhD graduates just want to get a job to pay the bills after having been a student for at least 8-10 years (3 year bachelor degree, 1 year honours, maybe 1-2 years of a masters degree in between, then 3-4 years doing the PhD). It's not so much about passion but rather finally having something you could call a real job, start a family etc.
For most post-PhD scientists working in the public sector (actually quite a few also in the private sector), there's a constant pressure to publish and a constant pressure to apply for grants. That kind of circumstance adds to an already competitive atmosphere and politics can be very harsh at that level. Some researchers, after having spent so much of their lives reaching the point of completing their PhD, aren't in the frame of mind of quitting and doing something else.
For those successful scientists, it is because they were lucky in their career path, or they are naturally scrupulous political players who clawed and manouveured their way to the top. Perhaps you could argue that it comes down to this that they have a passion for. In fact for many scientists at this stage, it's not about the discovery anymore, not about contributing to help mankind by finding a cure for a disease, not about working together to achieve common goals. It's more about how many papers you've published in which journal, reputation, the number of grants (if at all) you are able to score, how many competitors you have who are doing the same research you're doing somewhere else in the world, the politics you have to play..