At that time, catalyst development and optimization strongly relied on phenomenological approaches and experimental know-how, whereas little knowledge existed on the nature of the catalytically active species and how to tune their structure and concentration.
Nevertheless, says Daniel Colbert, a physicist at Rice University in Houston, "nothing like this has been done before, and the experimental know-how to be able to do this is highly impressive".
You never know how something experimental like the Dark Zone is going to work".
But, he said, to be experimental, first you have to know how to use all the rules of grammar.
It's hard to know how you display experimental things that weren't made to be displayed, that existed only in the studio.
Despite a great experimental effort, we still do not know how widespread tetramer formation is in the Arabidopsis MADS domain transcription factor family.
In summary: Experimental as you like, these four experienced New Yorkers know how to rock, how to dance and how to loop atonal guitar riffs for many minutes at a time.
Tuesday: after 10 minutes of experimental effort, get the whole car unlocked, but don't quite know how and can't repeat the success.
We don't really know how to handle tens of thousands of potentially lethal experimental robotic pilots buzzing around dense cities.
