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.
Learn about rules for knives, dangerous goods, and other carry-on or checked baggage items concerned by many passengers. 1  For passengers flying on a codeshare flight. 2  What you can't carry to the cabin. 3  Carry-on items with restrictions.  What you can't include in checked 1  baggage. Checked items with restrictions.