The distinctive bump found on what experts call a 'nonic' pint glass isn't just a random design quirk - it's a carefully engineered feature that has been used by bartenders for over a century.

“The Colorado Pint Day glasses have become coveted collector’s cup items so make sure to pick up this year’s edition to round ...

But while we will probably pick up hundreds if not thousands of pint glasses throughout our lives to take a sip of beer or cider, there’s a curious design feature on many glasses which you may ...