Bumblebees of the subgenus Psithyrus (known as 'cuckoo bumblebees', and formerly considered a separate genus) are brood parasites, sometimes called kleptoparasites, in the colonies of other bumblebees, and have lost the ability to collect pollen.ueen and worker bumblebees can sting. Unlike in honeybees, a bumblebee's stinger lacks barbs, so the bee can sting repeatedly without injuring itself; by the same token, the stinger is not left in the wound. Bumblebee species are not normally aggressive, but may sting in defence of their nest, or if harmed.
STEM CELLS SAVE LIVES. For decades, doctors have harnessed the unique ability of stem cells to treat leukemia and genetic blood diseases. But now, researchers are discovering that these cells have the power to heal, to fight disease, and to regenerate damaged or aging tissue throughout the body. To fully understand why they hold the potential to change your childâs medical future, get to know more about stem cells.
Penn researchers hope to one day isolate stem cells in an adult scalp and transplant those cells to other areas of the scalp, generating new follicles and hair growth. Using the stem cell transplant as a treatment for hair loss, however, is at least 10 years away, says Cotsarelis. The findings have implications not only for hair growth, but also for burn treatments. The cells that we have isolated not only make hair follicles, but also can make other skin cells, says Cotsarelis. These stem cells are there for your lifetime and have a huge capacity to proliferate and regenerate..