what controversial viewpoints (controversial either here or in real life) have you been developing recently. lets hear it. what work are you doing in this department
-
-
This Tweet is unavailable.
-
we know the recipe of Roman concrete https://en.wikipedia.org/wiki/Roman_concrete#Modern_use … there are lots of theories on Egyption and Inca stonework ; see youtube for lots of recreations
End of conversation
-
Loading seems to be taking a while.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.