It is not obvious how to walk the line between hedging too little and hedging too much.
This may be context-dependent. Different countries probably have different cultural norms. Norms may differ for higher-status and lower-status speakers. Humble speech may impress some people, but others may perceive it as a sign of weakness. Also, is your audience fellow scientists or are you writing a popular science book? (More hedging for the former, less hedging for the latter.)
This may be context-dependent. Different countries probably have different cultural norms. Norms may differ for higher-status and lower-status speakers. Humble speech may impress some people, but others may perceive it as a sign of weakness. Also, is your audience fellow scientists or are you writing a popular science book? (More hedging for the former, less hedging for the latter.)