How many angels can dance on the head of a pin? dancing on a needle's point occurs in an expository work by the English divine, William Sclater (1575-1626). In "An exposition with notes vpon the first Epistle to the Thessalonians" (1619), Sclater claimed that scholastic philosophers occupied themselves with such pointless questions as whether angels "did occupie a place; and so, whether many might be in one place at one time; and how many might sit on a Needles point; and six hundred such like needlesse points." Harrison proposes that the reason an English writer first introduced the "needle’s point" into a critique of medieval angelology is that it makes for
Celeus (bird) 19–32 cm. They are generally not sexually dimorphic and have evolved specialised morphology to match their unique lifestyle. The "Celeus" beak differs from other woodpeckers in that it is mainly curved, not long and without nostril feathers. Like other woodpeckers its beak has a chisel like cutting edge. A hard rhamphotheca and complex beak microstructures strengthen the bill for pounding and drilling. The tail has evolved for support, clinging and climbing, acting as a third leg or tripod. The pygostyle (tail vertebrae) is larger for strong tail muscles to be inserted and it is more or less stiff. There are