Can I become the rat king?

I’m playing a blind (but with 60ft true sight) half-elf bard with animal handling and animal friendship in a D&D 5e game. I’m interested in capturing two wild rats and breeding them into any army that scouts, attacks and defends on command.

Is this doable? I looked into litter sizes, gender ratios and gestation periods. I assume 600 rats in a year’s time.

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Is ICT a good basis to become a good embedded software engineer?

I’d like to get a job as an embedded software engineer, I like electrical engineering but I love programming so I figure embedded software is a nice mix between the 2.

Therefore I would like to know wetherit is better to take an electrical engineering course and choose embedded system related minors or is it better to do an ICT course and steer towards embedded systems?

When targeting API 26, overflow menu items become invisible

I have an options menu in my app, which has more than six items, so there is a “More” item that brings up the overflow menu. The menu is posted by the default menu triggers, and a custom trigger that invokes Activity.openOptionsMenu().

The menu itself is built from this resource file:

<menu xmlns:android="">     <item android:id="@+id/mi_copy"           android:title="Copy"           android:icon="@drawable/copy"/>     <item android:id="@+id/mi_paste"           android:title="Paste"           android:icon="@drawable/paste"/>     <item android:id="@+id/mi_preferences"           android:title="Preferences"           android:icon="@android:drawable/ic_menu_preferences"/>     <item android:id="@+id/mi_flip_calc_printout"           android:title="Print-Out"           android:icon="@drawable/printer"/>     <item android:id="@+id/mi_clear_printout"           android:title="Clear Print-Out"           android:icon="@android:drawable/ic_menu_close_clear_cancel"/>     <item android:id="@+id/mi_about"           android:title="About Free42"/>     <item android:id="@+id/mi_import"           android:title="Import Programs"/>     <item android:id="@+id/mi_export"           android:title="Export Programs"/> </menu> 

So far, so good. The menu and the Java logic that creates and posts it has worked for years, but now I’m changing the targetSdkVersion from API level 8 to 26, per the latest Play requirements, and now all of a sudden, the menu items in the overflow menu have become invisible.

The overflow menu still posts, and it still has the correct size, and the menu items still work. You just can’t see them any more: the whole menu is solid black now, which is the normal background color; the menu item text is missing.

The phone on which I’m testing is a Motorola G5 running Android 8.1.0. This is the only device I have available for testing with API 26 at the moment, at least until I figure out how to create an AVD with API >= 26.

N.B. In the Android simulator with an API level 8 image, the overflow menu still looks fine. It used to look fine on the Moto G5 as well, before I targeted API 26. If I change the target back to 8, the overflow menu works again.

Any thoughts on what I could do to fix this? My Google skills aren’t working on this one… Any ideas would be most welcome!

Can too-tight lens hoods become accidental apertures?

There is frequently the suggestion to use tighter lens hoods than specified for some lenses when they are used with smaller sensors than they are designed for. The idea is that the vignetting introduced does not matter with the smaller imaging circle.

Now a constriction in front of a lens can and has been used as an external aperture stop. Is there a risk of unintentionally lowering your aperture by using a too-tight lens hood?

How does quicksort with 3-way partitioning ~ (2 ln 2) N become linear time complexity with many duplicated keys?

From Algorithms 4th:

Quicksort with 3-way partitioning uses ~$ (2\ln 2)NH$ compares to sort $ N$ items, where $ H$ is the Shannon entropy, defined from the frequencies of key values.

$ H = -(p_{1}\log_{2}{p_1} + p_{2}\log_{2}{p_2} + …. + p_{k}\log_{2}{p_k}) $

Given $ N$ keys with $ k$ distinct key values, for each $ i$ from $ 1$ to $ k$ define $ f_{i}$ to be frequency of occurrence of the $ i$ -th key value and $ p_{i}$ to be $ f_{i} / N$ , the probability that the $ i$ -th key value is found when a random entry of the array is sampled.

How does $ (2 \ln 2)NH$ become linear when there are many duplicated keys?

When did rolling a natural 20 on the d20 become a “critical success” in the history of Dungeons & Dragons?

I’ve only played Dungeon and Dragons in its 5th edition, and only limited exposure of earlier editions from PC games, but never understand the rule behind it (or know the calculations), so I’ve never noticed whether the term natural 20 and its significance, including critical hits and success, is applied in earlier editions.

I’ve watched and read some DnD-themed comics and clips, and I’ve noticed there are plenty examples that suggest that rolling natural 20 means critical success, i.e: succeeding in whatever you are attempting, regardless how stupid and bizarre the result may be, including seducing the BBEG and marrying them.

I’m mainly interested how and when rolling natural 20 is introduced as critical success. This may be in attack roll, ability check, or saving throw. The earlier the better.