Existuje dlouhá řada zpráv o kojících mužích. Samci mnoha savčích druhů vykazují určitý potenciál pro produkci mléka. Laktaci samců se ale staví do cesty závažné překážky a ta se proto u žádného druhu savců nevyvinula. Jediné výjimky – dva druhy tropických kaloňů – jsou i nadále sporné., There have been many descriptions of breastfeeding men and males of many mammalian species have the potential to produce milk. However, there are the formidable barriers to the male lactation and this has never evolved in mammalian species. The only exceptions – two species of tropical fruit bat – remain dubious., and Jaroslav Petr
The most common volcanoes on Earth are kilometre-sized scoria cones; conical edifices of pyroclastic material originating from explosive volcanic activity. Interestingly, scoria cones, as known on Earth, have not been observed on any other terrestrial body in the solar system despite the fact that magma degassing, and hence magma fragmentation, has to also occur on these bodies. Why?, Petr Brož., and Obsahuje bibliografické odkazy
The minority of healthy subjects can (without previous learning) breathe at exactly double of their resting tidal volume on demand. The aim of the present study was to find whether this estimate of tidal volume value can be learned and at what speed. Basic spirometric values were measured by Oxycon B in 20 healthy volunteers. They learned in one day to breathe at double of the resting tidal volume twice for 3 min. The existence and duration of the memory trace was ascertained four times (three times on the same day, once three weeks later). This engram can be demonstrated on the day of learning after 1 or 2 trials of 3 min each. Three weeks later the memory trace is weak but still present. This fact means that a new breathing pattern can be learned. During learning and tests the subjects hyperventilate but no correlation was seen between learning ability and intensity of hyperventilation.