What would we do if an attempt by hackers or an enemy state to take down the internet would succeed? Even though the internet is essentially a huge decentralized network of cables, the DNS structure is no so decentralized and has already been target of attacks. Even this week, a distributed attack on Dyn's DNS caused many US visitor unable to reach popular sites like Twitter and Github.

There are also governments that censor sites like Twitter and Google for political reasons. People have a natural wish to share information, and this question is really about how this can be facilitated when common social network sites are down.

Gisteren ben ik bij Facet bijgepraat over de veranderingen omtrent de nieuwe Wet Deregulering Beoordeling Arbeidsrelaties (DBA). Ik probeer hier zonder mijn aantekeningen een samenvatting te maken van wat ik begrepen heb.

Kortgezegd zijn er drie criteria die na 1 mei bepalen of je volgens de Belastingdienst feitelijk in loondienst bent:

Last year I experimented with the Play Framework to find out how it works and what its strengths and weaknesses are. Although I was quite enthousiastic about it, I did not look at it any further, seeing no immediate need for it in my professional life. Now, a year later, I decided to dive into Scala. A free online course is being given by the creator himself, Martin Odersky, on Coursera. I am very happy about both the presentation and the level of the course. The lectures and the exercises are of a high level, and the whole package is well thought through.

Raspberry Pi closeup

Since a few days I'm the proud owner of a Raspberry Pi. It's a simple, but complete computer that allows -or rather encourages- tweaking. Since I ordered it (months ago), I have been thinking about what to do with it. There are some features that make the Pi special:

Solar charged battery


Veel apparaten hebben adapters om de netspanning van 230V wisselspanning om te zetten naar lage gelijkspanning. Helaas lijken er net zo veel voltages te zijn als adapters. Gelukkig is er een positieve ontwikkeling. Onder aanmoediging van de EU, hebben de belangrijkste telefoonproducenten nu afgesproken dat toekomstige telefoons met de standaard USB aansluiting worden opgeladen. Hopelijk zet deze trend zich voort naar andere (oplaadbare) apparaten in huis. Om USB-apparaten, AA batterijen en de Li-ion batterijen van mijn fototoestel te kunnen laden met zonne-energie, heb ik onderstaande opstelling gemaakt.