These include studies of the therapeutic value of CBD for: 1  Treatment of substance use disorders (opioids, alcohol, cannabis, methamphetamine) 2  Attenuation of the cognitive deficits caused by THC. 3  Neuropathic pain due to spinal cord injury.  Mitigating the impact of cannabis use on risk for schizophrenia.
Every fourthyear is a leap year, as a rule of thumb. But that's not the end of the story. A year that is divisible by 100, but not by 400, is not. So 2000 was a leap year under the Gregorian calendar, as was 1600. But 1700, 1800 and 1900 are not leap years.
Purpose Of Leap Year. A year isn't exactly 365 days. The Earth rotates about 365 1/4 times in the time it takes to go round the Sun, so to prevent the calendar getting out of phase with the seasons,a complicated set of rules has been developed to add leap years; every 4 years except for centuries, except every 4th century is a leap year, etc.