Colm Mulcahy
@cardcolm.bsky.social
Prof Emeritus Spelman College, Adjunct Prof SETU, Ireland. Board Gathering 4 Gardner. Curator Annals of Irish Maths. Author "Mathematical Card Magic" AKP/CRC (2013).
Basically chocolate covered cornflakes.
From a Tankstelle near my last hotel in Berlin. Nothing else was open that late.
From a Tankstelle near my last hotel in Berlin. Nothing else was open that late.
November 15, 2025 at 12:11 PM
Basically chocolate covered cornflakes.
From a Tankstelle near my last hotel in Berlin. Nothing else was open that late.
From a Tankstelle near my last hotel in Berlin. Nothing else was open that late.
Just landed in Dublin.
‘Tis a soft day.
Eine feuechtest Tag.
‘Tis a soft day.
Eine feuechtest Tag.
November 15, 2025 at 11:39 AM
Just landed in Dublin.
‘Tis a soft day.
Eine feuechtest Tag.
‘Tis a soft day.
Eine feuechtest Tag.
10% Stork Club “rye wine” beer!
Since I arrived in Berlin 3 weeks ago I’ve searched for high gravity German beer with little success.
After an hour walking around Berlin airport now, checking what’s on offer at every shop and cafe, I finally found what I was looking for at the very last place.
Since I arrived in Berlin 3 weeks ago I’ve searched for high gravity German beer with little success.
After an hour walking around Berlin airport now, checking what’s on offer at every shop and cafe, I finally found what I was looking for at the very last place.
November 15, 2025 at 8:45 AM
10% Stork Club “rye wine” beer!
Since I arrived in Berlin 3 weeks ago I’ve searched for high gravity German beer with little success.
After an hour walking around Berlin airport now, checking what’s on offer at every shop and cafe, I finally found what I was looking for at the very last place.
Since I arrived in Berlin 3 weeks ago I’ve searched for high gravity German beer with little success.
After an hour walking around Berlin airport now, checking what’s on offer at every shop and cafe, I finally found what I was looking for at the very last place.
You know you’ve done something right when youngest daughter sends this photo of Sichuan dinner she cooked herself.
Mrs Chang’s Sichuan Cookery book has been in the family for over 40 years.
Mrs Chang’s Sichuan Cookery book has been in the family for over 40 years.
November 15, 2025 at 5:45 AM
You know you’ve done something right when youngest daughter sends this photo of Sichuan dinner she cooked herself.
Mrs Chang’s Sichuan Cookery book has been in the family for over 40 years.
Mrs Chang’s Sichuan Cookery book has been in the family for over 40 years.
No I haven’t.
Not ever close. Hhm. Just when I thought I could trust you.
Not ever close. Hhm. Just when I thought I could trust you.
November 14, 2025 at 4:48 PM
No I haven’t.
Not ever close. Hhm. Just when I thought I could trust you.
Not ever close. Hhm. Just when I thought I could trust you.
Some memorials to people killed at this Xmas market in Magdeburg last year.
Sigh. The trial of the accused just started.
Sigh. The trial of the accused just started.
November 14, 2025 at 4:04 PM
Some memorials to people killed at this Xmas market in Magdeburg last year.
Sigh. The trial of the accused just started.
Sigh. The trial of the accused just started.
A common sight in Germany these days.
November 14, 2025 at 3:55 PM
A common sight in Germany these days.
Hey @8radioireland.bsky.social the Recently Played list online hasn’t changed for days!
November 14, 2025 at 5:30 AM
Hey @8radioireland.bsky.social the Recently Played list online hasn’t changed for days!
Excellent Gänseleber dinner at Alter Krug near FU Berlin.
My time here is running out.
My time here is running out.
November 13, 2025 at 9:03 PM
Excellent Gänseleber dinner at Alter Krug near FU Berlin.
My time here is running out.
My time here is running out.
Sunrhein on the rise
November 13, 2025 at 10:15 AM
Sunrhein on the rise
Red squirrel along the Rhein near Sürth.
November 13, 2025 at 6:58 AM
Red squirrel along the Rhein near Sürth.
Not to mention my Cologne lunch earlier today…the würst was huge and the bratkartofflen were the best I’ve ever had. Loaded with crispy onions and bacon and for once there was enough gravy.
November 12, 2025 at 10:28 PM
Not to mention my Cologne lunch earlier today…the würst was huge and the bratkartofflen were the best I’ve ever had. Loaded with crispy onions and bacon and for once there was enough gravy.
A real live organ grinder in Cologne today!
No monkey.
No monkey.
November 12, 2025 at 9:58 PM
A real live organ grinder in Cologne today!
No monkey.
No monkey.
Finally had a huge schnitzel today in Cologne, with creamy mushroom sauce and bratkartofflen. Yum.
November 12, 2025 at 9:44 PM
Finally had a huge schnitzel today in Cologne, with creamy mushroom sauce and bratkartofflen. Yum.
Polygonal chairs in dept of mathematics at University of Cologne
November 12, 2025 at 4:56 PM
Polygonal chairs in dept of mathematics at University of Cologne
Thursday, 13 November 2025, catch me back in Berlin!
I give a plenary talk at the 11th annual Berlin Mathematical Society Day!
"Mathemagic with a Deck of Cards "
www.math.berlin/veranstaltun...
I give a plenary talk at the 11th annual Berlin Mathematical Society Day!
"Mathemagic with a Deck of Cards "
www.math.berlin/veranstaltun...
November 12, 2025 at 9:17 AM
Thursday, 13 November 2025, catch me back in Berlin!
I give a plenary talk at the 11th annual Berlin Mathematical Society Day!
"Mathemagic with a Deck of Cards "
www.math.berlin/veranstaltun...
I give a plenary talk at the 11th annual Berlin Mathematical Society Day!
"Mathemagic with a Deck of Cards "
www.math.berlin/veranstaltun...
Going back to at least 1433, St Georg’s in Rodenkirchen along the Rhein, just south of Köln.
That rope is to ring the bell.
That rope is to ring the bell.
November 11, 2025 at 10:09 PM
Going back to at least 1433, St Georg’s in Rodenkirchen along the Rhein, just south of Köln.
That rope is to ring the bell.
That rope is to ring the bell.
This Wednesday at 16:30 in Cologne, I speak on "From One, Two, Many, to ABC (or ten reasons why mathematics isn´t as easy as 1,2,3)''
www.mi.uni-koeln.de/main/Alle/Ka...
www.mi.uni-koeln.de/main/Alle/Ka...
November 11, 2025 at 7:52 PM
This Wednesday at 16:30 in Cologne, I speak on "From One, Two, Many, to ABC (or ten reasons why mathematics isn´t as easy as 1,2,3)''
www.mi.uni-koeln.de/main/Alle/Ka...
www.mi.uni-koeln.de/main/Alle/Ka...
Who said that the Germans don’t have a sense of humour?
This is by the entrance of an office building in Bonn.
This is by the entrance of an office building in Bonn.
November 10, 2025 at 10:26 PM
Who said that the Germans don’t have a sense of humour?
This is by the entrance of an office building in Bonn.
This is by the entrance of an office building in Bonn.
First Bonn walk from bridge(s) and banks to Beethoven.
November 10, 2025 at 10:21 PM
First Bonn walk from bridge(s) and banks to Beethoven.
Great lunch in Bonn. Stuffed cabbage with rich gravy and mash.
Not a vegetable in sight, natürlich:-)
Not a vegetable in sight, natürlich:-)
November 10, 2025 at 10:03 PM
Great lunch in Bonn. Stuffed cabbage with rich gravy and mash.
Not a vegetable in sight, natürlich:-)
Not a vegetable in sight, natürlich:-)
Stepped off train in Köln on platform 1 and this view greeted me.
November 10, 2025 at 9:28 AM
Stepped off train in Köln on platform 1 and this view greeted me.
These are the only platforms at this German train station.
November 10, 2025 at 7:47 AM
These are the only platforms at this German train station.
Do you see what I see?
Sines and cosines.
Sines and cosines.
November 9, 2025 at 1:08 PM
Do you see what I see?
Sines and cosines.
Sines and cosines.