In an experiment, a control is used to establish a baseline to compare the results of the main experiment to. Having a control group rules out any environmental variables, such as temperature and... In an experiment, a control is used to establish a baseline to compare the results of the main experiment to. Having a control group rules out any environmental variables, such as temperature and...
Knives, including small pocket knives, are only allowed in checked bags. Only plastic and round-tip butter knives are allowed as carry-on blades. Most bladed items are allowed in checked baggage, including scissors, razors, swords, axes, box cutters and blade tools, if they are properly wrapped or sheathed.
Most knives are not allowed past the security checkpoint (including, but not limited to, pocket knives, folding or retractable blades regardless of blade length or composition, box cutters, X-ACTOÂ® knives, scissors with a pointed tip, straight razors, and LeathermanÂ® or Victorinox Swiss ArmyÂ® knives).