That takes tricky navigation: research by Bristol University's centre for market and public organisation finds most mergers lead to higher debts, longer waits and poorer results.
How to define it is tricky, but research in has found that anywhere from 35%to75%75% of women have experienced some kind of sexual abuse in their lifetimes.
Renewal proposals are especially tricky because sometimes research that was once cutting edge just isn't anymore.
Indeed, the most recent analysis, published in 2014, found that, when considering only the highest-quality evidence, food and drink sweetened with aspartame and the like were associated with a moderate reduction in weight.But the epidemiological research is tricky to interpret, says Kristina Rother, a researcher at the National Institutes of Health, in Maryland.
It is an ethically tricky area, because trauma research can involve trying novel treatments on severely injured patients who cannot give informed consent.
I'll quite often find myself thinking about either a tricky patient or a research problem late into the evening, although once I'm in bed it's not difficult to sleep.
Limb said securing funding for this type of research is tricky, but he hopes to study brain activity across various types of creative activities, including writing and painting.
And getting good eggs for such research is trickier than it may seem.
Randomised trials, which are the gold standard in medical research, will be tricky to impossible: women are unlikely to accept a researcher's arbitrary instruction about where they should give birth.
