In this list, we’re bringing you just the cold, hard, scientific facts. Be careful though – while the facts on this list are based on science, they cannot necessarily be used as definitive proof that someone is lying to you. (For instance, if someone clears their throat, maybe they just haven’t had a drink of water in a while.) The combination of multiple factors on this list and comparing what someone says to the objective truth is what will help you know if a person is lying. After all, lie detector machines aren’t even right 100% of the time. Some people are able to control their lying or minimize the cues given while lying. So, even though they shouldn’t be used to condemn someone right off the bat, the facts on this list can help if you suspect someone is being untrustworthy. See if you can spot any liars or fibbers with these 25 Ways to Know Someone is Lying to You.