Again we open the Mailbag and answer our listeners' questions.

What do lisps sound like in languages without the 'th' sound? How do gender-neutral terms work in languages with gendered pronouns? Do languages get more efficient over time? 'One-third' looks like 'three', so why doesn't 'half' look like 'two'? Does any poetic meter mimic the "natural rhythm" of human speech? How do children acquire humour?

All on this episode of Talk the Talk.