The largest look like the arrowheads of giants, and can sell for thousands of dollars.

NEWYORKER: Bones of Contention

The successor of the Clovis culture, the Folsom culture, is also defined by its arrowheads.

ECONOMIST: Mass extinctions

Sepia-toned photos decorate the walls next to displays of arrowheads and knives.

FORBES: Magazine Article

The stringy branches floated in a cool breeze, while the leaves, like a swarm of arrowheads, flickered in the soft rays cast by the street lights.

NEWYORKER: The House Behind a Weeping Cherry

Several internal fireplace hearths were also identified and more than 1, 000 flint artefacts were found, including materials which would have been used as tools and arrowheads.

BBC: Artist's impression of the house

These are bigger than arrowheads, of course, and are made of metal and plastic, which are easier to detect, but their basic purpose is essentially the same.

ECONOMIST: Archaeology

Arrowheads dating from the Bronze Age were also discovered.

BBC: nit comb

So far it has been impossible to decide if these arrowheads were the tools of new people from Asia who replaced their dead cousins, or of a remnant of Clovis people who changed their technology and survived.

ECONOMIST: Mass extinctions