Friday, August 18, 2017

Statistics - Type I and Type II Errors

Man pregnant ... Type I error - False positive
Woman not pregnant ... Type II error - False negative
Why didn't my stats lecturer explain it to me this way !

Please visit my main page at

Sunday, August 13, 2017

Same face for male and female

In this illusion by Richard Russell, the same face appears to be female when the skin tone is made lighter (left image) and male when the skin tone is made darker (right image).

The illusion works because changing the skin tone affects the face’s contrast – the difference between the darkest parts of the face (lips and eyes) and lightest parts (the skin).

Few would regard facial contrast as a defining feature of either sex, but in fact, contrast is on average higher in females than males.

Even without consciously knowing it, our brains are attuned to the difference in contrast between the sexes, and so contrast is one cue the brain uses to determine gender. When other cues are removed, contrast can be the deciding factor.

Please visit my main page at

Tuesday, August 8, 2017

Thursday, August 3, 2017

Vevey Funi

Photographed in 2014-09 along Grand' Rue, Montreux, Switzerland ~~~
For English speakers, the bus in front is  Very Funny  :-)

In case you are curious:
- Vevey-Funi is Vevey-Mont Pelerin funicular station in Vevey.
- Left red arrow in the upper pic: Eurotel Montreux, Grand' Rue 81, 1820 Montreux, Switzerland
- Right red arrow: Fer de Lance, Grand' Rue 74, 1820 Montreux, Switzerland

Please visit my main page at

Sunday, July 23, 2017

Earth is the only planet with wine

Photographed in 2017-06
A sign in Pan y Mermelada, a restaurant/cafe

"Save the Earth   It is the only planet with wine"

By the way, Pan y Mermelada is a nice restaurant. Food is tasty ... well worth visiting !
Address: Calle Cárcer, 2, 29008 Málaga, Spain  (Corner of Calle Cárcer & Calle Beatas)

Please visit my main page at

Tuesday, July 18, 2017

Two types of people with petrol

There are 2 types of people in this world:
    A:  "OMG, I need to fill up!"
    B:  "I got this."

Please visit my main page at

Thursday, July 13, 2017

Almost there

What to say when a hiker asks, "How much farther to the top?"
"You are almost there."
"You are almost there."
"You are almost there."
"You are almost there."

Please visit my main page at

Saturday, July 8, 2017

Exit in Chinese

For those who know Chinese ... I photographed this funny exit sign in Málaga Cathedral, Málaga, Spain in 2017 June.
Instead of blaming the clueless Spanish sign maker, perhaps the whip should be applied to Google.
Do a Google translate of the Spanish word "Salida" into Chinese, and you get 產量.
The Spanish sign maker was merely following the maxim "In Google We Trust" ... a bit worrying in a cathedral  :-)
(產量 means something along the line of: Production output / yield ... not "Exit")

Please visit my main page at

Monday, July 3, 2017

Thursday, June 8, 2017

Judy Garland and Scarecrow

Judy Garland: "How can you talk if you haven't a brain?"
Scarecrow: "Oh some people without brains do an awful lot of talking."

It is because some people have a hole in the back of their heads and the wind blows their tongues around!

Please visit my main page at

Tuesday, May 23, 2017

Glasses not seeing things wife's way

Wife to optometrist:
"I'm returning these glasses I bought for my husband. He's still not seeing things my way."

The husband needs rose-tinted glasses  :-)

Please visit my main page at

Thursday, May 18, 2017

Beautiful Walpa Gorge, Kata Tjuta, NT, Australia

Walpa Gorge is a gorge between two of the highest domes in Kata Tjuta (The Olgas), Northern Territory, Australia.

Here is a rare, but most stunning scenery of water pouring down the cliff faces of the gorge:
The photograph was taken in 2013-05 in pouring rain. The rain ruined my camera ... but to be able to witness such a scene is well worth it.

Photograph courtesy of Ricky who was mad enough to be with me in that trip.

As of today, I can't find any picture posted by others on the internet of the gorge in the rain.

By contrast, here is a photograph of the same gorge taken by me 14 months later in 2014-07 in a sunny afternoon. Still a sight to behold, but I prefer the beauty of the previous pic.
( More photos and trip report on Walpa Gorge are in my blog: )

Please visit my main page at

Saturday, May 13, 2017

My abode in the woods

Some people want a big house, a fast car, and lots of money.
Others just want a tiny cabin in the woods away from those kinds of people.

Please visit my main page at

Monday, May 8, 2017

Caterpillar tree ferns - Dicksonia antarctica

The 2 photographs here are Soft Tree Ferns, Dicksonia antarctica. They have fallen or bent into an arch. On reaching the ground, the stems turn vertical and continue to grow and hence having the appearance of giant caterpillars crawling on the forest floor.
Although Dicksonia antarctica is a common species in Australia, seeing them in a caterpillar state is quite rare.

But in Dicksonia Forest Ravine, there is a forest of Dicksonia antarcticas, and many of them are in this caterpillar state. More photosgraphs of these caterpillars, and a trip report to the ravine are in my blog:

By the way, the ravine is like an enchanted world, like a mythical fairy land. You should visit it if you have a chance.

(Dicksonia Forest Ravine is in the north-western corner of Blue Mountains National Park, NSW, Australia. Click on the above blog link for the precise location.)

Please visit my main page at