but yo-yo it's also a toy (I think in English it's called the same) so, someone that is a yo-yo can mean that it is a person that can be easily manipulated like a yo-yo or a person that changes humor or personality or ideas, very frequently. Also can be referd as a person, that comes and goes, easily (like in and out of relationships)
Malathion is an insecticide in the chemical family known as organophosphates. Products containing malathion are used outdoors to control a wide variety of insects in agricultural settings and around people's homes. Malathion has also been used in public health mosquito control and fruit fly eradication programs. Malathion may also be found in some special shampoos for treating lice.
That makes malathion a probably carcinogenic to humans, said the study appearing on the website of Lancet Oncology. (www.thelancet.com/oncology). Malathion was linked to a risk of non-Hodgkin lymphoma in Canada, the United States and Sweden and to prostate cancer in one Canadian study, the IARC said. It added, however, that the study involved tests on rats and mice in laboratories and that no cases had been recorded in humans.