General tips
Talk about your figures when you describe data
Specifics, specifics, specifics
Provide examples if you wish to illustrate a point.
Use precise language – don’t just say “A is better than B” – say “A is two-fold more expressed than B under these conditions”
Data is always plural
Books & Resources on how to improve your writing (ranked list borrowed from ZLab):
The Elements of Style by Strunk and White
read/listen to The Economist
Writing Science by Joshua Schimel
On Writing Well by William Zinsser
How to Read a Book: The Classic Guide to Intelligent Reading by Mortimer J. Adler and Charles Van Doren
Bird by Bird by Anne Lamott
They Say I Say by Gerald Graff and Cathy Birkenstein
The Only Grammar Book You Would Ever Need by Susan Thurman and Larry Shea