Bitcoin’s blockchain hasn’t been hacked. The system of mining coins hasn’t been comprised. Like it or hate it, if anything the collapse of centralized exchanges makes the case for Bitcoin stronger. I’m a pragmatist. There is something revolutionary about being able to create a unique in...
An activity-theoretic approach to multi-touch tools in early maths learning. Int. J. Technol. Math. Educ. 2013, 20, 3–8. 18. Ladel, S.; Kortenkamp, U. Artifact-Centric Activity Theory—A framework for the analysis of the design and use of virtual manipulatives. In International ...