Our understanding of common phrases doesn’t always line up with what they originally meant. Writer and humourist Eli Burnstein helps us discover the true origins behind "carpe diem," "you are what you eat," and "ignorance is bliss"... and reflects on what we can learn by putting their historical, literary and philosophical contexts back in place.

Plus: David Suzuki says he has done everything he could to protect the Earth, but fears he has fallen short. The environmental activist and broadcaster reflects on his nine decades on the planet he loves, and what he envisions for its future.