Pizza can be eaten by hand or with the right cutlery.
And, according to a research team from the University of Maryland, the sharpest knives could soon be made of hardened wood.
In the first instance the soft part within wood – lignin – is partially removed. The remaining part is then treated with pressure and heat to get rid of the water inside.
That leaves cellulose, a molecule with a higher strength to density ratio than many metals or ceramics. Knives carved in this way are 23 times harder than natural wood and 3 times sharper than traditional knives.
A mineral-oil coating makes them hydrophobic, dishwasher safe and durable.
And, if they do lose their sharpness, perhaps this startup could help.