Android devices sometimes use wrong DNS server

Android devices sometimes use wrong DNS server. My assumption is, that it happens when device finds friendly WiFi access point, disconnects from mobile provider/ISP and is just finished connecting to it (WiFi using DHCP). It has setup DNS servers from WiFi, however, it still sends requests to DNS from mobile ISP via WiFi network.
It seems that some caching is going on, and it feels wrong… because mobile ISP may be blocking DNS requests from other networks.

Tested on Galaxy Tab 8.9″ with Android 3.2 and Galaxy Note 10.1″ with Android 4.0.4.

UPS C14 to 3 way Multi Socket Europlug 220V (2-pin)

I needed to plug into UPS a device with standard Europlug 220V. However, my APC UPS has only eight C13 sockets.

What I did? I bought a standard multi socket extension cord/lead with 3 outlets (variant compatible with Type C and F Electrical Outlets). Then, I cut off the standard plug, and swapped it with rewirable DIY C14 plug.

BTW, there is at least one manufacturer that is producing UPSes with Europlug. It is Orvaldi. See the last photo.