Raws li lub hauv paus tseem ceeb rau kev tshawb fawb txog kev tshawb fawb thiab kev cob qhia cov neeg ua haujlwm, lub chaw soj nstuam muaj kev kub ntxhov thiab muaj xwm txheej tsis tu ncua. Qhov no yog qhov tseeb tshwj xeeb tshaj yog nyob rau hauv cov chaw soj nstuam, uas siv ntau yam tshuaj lom neeg thiab ntau yam khoom siv hluav taws xob, thiab feem ntau muaj kev kub siab, siab siab, nqus tsev vacuum, hluav taws xob, hluav taws xob sib nqus, muaj zog (zoo siab) lub teeb thiab lwm yam.