1 Ã Van de Graaff generator 1 Ã electrically-insulating stool Some confetti, or aluminium foil, or foil cake trays. The demonstration. This demonstration involves high voltages, and so it should never be done by anyone with a pacemaker or other internal electrical device, or who thinks they might be pregnant.
Minimum Advance Purchase. Airlines increase prices dramatically 14 days and 7 days before departure, respectively, according to figures analyzed by FareCompare. To avoid these sharp spikes, you should aim to purchase your ticket a minimum of 15 days prior to departure. Air travel experts at FareCompare say that the window for purchasing tickets at the best price is between three months and 14 days in advance.
Even though the experts say the best time to book your flight for domestic travel is 21 to 35 days before you depart, if youâre comfortable with a hotel rate, no matter how far out you are from your travel dates, book it, recommends Maria Katime, spokesperson for KAYAK. âHotel rates are not as volatile as airfare.â.