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Robert Stuart San Francisco, California, US Do dogs know that other dogs are dogs just by looking at them? " We have no way of knowing how or if a dog "recognises" another dog as being different from its owner" This week's new questions On the small side Is there a limit to how small an adult arthropod can be? The back pages Two of a kind How do dogs recognise that another animal is also a dog when there is such a vast array of canine shapes and sizes?. [Extracted from the article]

The article offers reader-submitted answers to readers' questions on round versus flat shoelaces and growths on plant leaves, and presents questions to be answered in future issues on light-emitting diode (LED) lights in a power outage, color perception through sunglasses, and being caught lying.

The article presents questions and answers related to science including what causes the formation of crystals on plasticine, what causes a behaviour in butterflies known as puddling, and why more people are right-handed than left-handed.

The article presents answers to reader questions about the identity of a photographed insect found in Tuscany, Italy which was identified as a soldier fly larvae of the family Stratiomyidae and described as a scavenger or detritivore.

The article presents questions and answers related to scientific topics, including whether some foodstuffs are more likely to spoil in refrigerators because of bacteria that thrive in colder temperatures, questions on why humans are attracted to flowers, and a question as to why some infants struggle to remain awake.

The article provides an answer to a question on whether or not birds collide.

An answer is presented to a question of what caused a pigment pattern in a leaf.

The article offers information on a male dobsonfly seen in Costa Rica, which is in the order of Megaloptera and the genus Corydalus. Its larvae inhabit fresh running watercourse before crawling out and hatching. Males can be identified with their large mandibles, which can be up to 3 centimetres long. Jaws are used by males in mating displays and in threatening rival males.

The article provides an answer to a question on the sensitive plant or Mimosa pudica.

The article presents an answer to a question of how come insects like flies, wasps and bees do not fly in straight lines like most birds do.

This article states that large animals generally exert more pressure on the ground than small ones. The tiger is 125 times as heavy as the cat. If it were an exactly scaled-up model of the domestic cat, it would be five times as long, five times as wide and five times as high. Each paw would have 25 times the area of the cat's paw. So, 125 times the weight would be supported on just 25 times the area, and the pressure under the tiger's paws would be 5 times the pressure under the cat's paws. The pressures under the hooves of standing cows are between 10 and 15 newtons per square centimetre.