Electronics, technology, all forms of travel, all forms of communications, contracts, leases 'DON'T SIGN, DON'T BUY ANY OF THESE WHEN MERCURY IS RETROGRADE!' computers, stereos, TV sets... not a good time to treat the arms, the hands, the lungs, the nervous system, the nose, the brain... telephones tend to mess up, the media experiences glitches...
Electronics, cars, boats, motorcycles; any transportation medium purchased when Mercury is retrograde or is about to go retrograde can experience malfunctions and other problems, much more than when Mercury is direct. This also includes signing important papers, leases, documents, and such. You may overlook an important phrase or stipulation, or something may need changing. Test taking and exams may not proceed as smoothly. Buses often go on strike, there have been major riots that have occurred when Mercury was retrograde, meeting people can also go wrong, as giving precise and accurate directions and communications are off, snail mail is more likely to get misdirected and/or delayed.
One thing Mercury retrograde is favorable for is doing editing and revising. This is a time to go over anything written, your website, or anything that was begun when Mercury was direct and do editing, correcting and such. Research can also be favorable when Mercury is retrograde.
Travel, planning, communications, technology, education, business transactions; all areas ruled by Mercury have a much stronger tendency to be affected with glitches and delays. Plans are often altered by unexpected circumstances, such as Columbus winding up in America rather than India [very typical of retrograde Mercury], your house cusps that contain Gemini and Virgo, and the house with Mercury in it; the affairs of these can also go awry.
