DataThief III by Bas Tummers Ever have the need to pull data from a publication but you cannot access the raw data. Perhaps it is from an old publication and the graph was hand drawn or the data files that went into making the graph have been long lost through the evolution of data […]
Obsidian tools
Obsidian is a volcanic extrusive rock with a glassy texture that is very hard and dense. The volcanic glass is usually black in colour, but it can also be dark green and brown. In rare cases trace elements of mineral crystals can cause obsidian to reflect light in various colours, or even the colour spectrum […]