But, as Kauder Nalebuff's book illustrates, this is a subject long mired in shame and confusion – there are girls who know nothing about periods until their first one arrives, and assume it is a sign of impending death.
Washington also illustrates that shadows, like buildings themselves, are relative.
We'd like you to share a picture that best sums up your PhD journey – something that either illustrates the research you're doing or how you feel.
Gaël Clichy's meek defending when James Perch scored Wigan's second probably illustrates why Pellegrini prefers Aleksander Kolarov, who is not immune to the odd dicey moment, while Joleon Lescott, making a rare appearance, was also shaky.
The final report from the Independent Panel on Forestry, for example, illustrates the build-up of diseases such as Asian longhorn beetle in broadleaved trees, Cryphonectria parasitica on sweet chestnut, oak processionary moth, acute oak decline, and other fungal diseases on a range of trees.
Although trivial, I believe my experience clearly illustrates how financial organisations like NatWest have exploited the hard-working, responsible earner; abused the trust that was placed in them; creamed off the handsome profits that came as a result of their irresponsible lending; and now try to make themselves out to be "responsible" at the expense of the people who have fed them.
A case involving the alleged rape of five mentally handicapped girls at Mumbai care home Kalyani Mahila V Balak Seva Sanstha in March grimly illustrates this.
And, of course, it does one other important thing – it illustrates all too graphically the worst of the west's hypocrisies.
Maputo beach on the outskirts of Mozambique's capital illustrates this in many ways.
However, the passion demonstrated by the protesters before things turned nasty illustrates how important the union flag and Belfast's city hall continue to be, symbolically linking the rest of the UnK to swaths of unionists and loyalists in Northern Ireland.
From page one he illustrates with visceral reminders of the unfair world we live in: he begins with the Marikana mining massacre and he never lets up.
