Top 100 presentations

1. Continuous Verb Tenses
   34895
2. Support and transport in plants
   33483
3. Anyong Tubig Anyong Lupa sa Asya
   29086
4. Elements compounds and mixtures
   25680
5. Chromosome
   21467
6. Simple Verb Tenses
   20628
7. Balancing Chemical Equations. Balancing redox equations
   19826
8. Atomic Structure
   19758
9. Periodic Behavior
   19698
10. Newton’s laws of motion
    18568
11. Periodic Trends
    16625
12. Adverbs
    16548
13. Percent Composition, Empirical and Molecular Formulas
    15873
14. Animal Farm
    15561
15. Bonding, Molecular Shape & Structure
    14481
16. MakingFood
    13209
17. Circulation and Gas Exchange
    13070
18. Fungi
    12697
19. DNA - An overview
    12654
20. Atomic Structure and Periodic Trends
    12587
21. Volumetric
    12487
22. Feminism- Cure or Curse
    12402
23. Atomic Structure and Periodicity
    12256
24. Hormones and the Endocrine System
    11825
25. Derivation Applications of Bernoulli Principal
    11687
26. Animal Development
    11677
27. Osmoregulation and Excretion
    11159
28. Plasma Membrane-Gateway to the Cell
    10618
29. Plant Structure, Growth, and Development
    10407
30. Acid, bases and salts
    9980
31. Development
    9928
32. Mirrors and Lenses
    9859
33. Structure of the Atom
    9761
34. Balanced forces
    9756
35. Pronouns
    9651
36. Mass Spectrometry
    9646
37. Nouns
    9551
38. Ancient Civilizations
    9516
39. Forests
    9237
40. Support and transport in plants
    9172
41. Atomic Structure
    9144
42. Resource Acquisition and Transport in Vascular Plants
    9082
43. Cell Types and Cell Structure
    8900
44. Newton’s third law of motion
    8767
45. Animal Nutrition
    8454
46. Transplantation Immunology
    8427
47. Cellular respiration
    8322
48. Growing Plants
    8148
49. Electrical Circuits
    8112
50. Sensory and Motor Mechanisms
    8012
51. Prepositions
    7894
52. Lab Equipment
    7863
53. Plant Responses to Internal and External Signals
    7796
54. Viruses, Viroids, and Prions
    7719
55. Neurons, Synapses, and Signaling
    7643
56. Of Mice and Men
    7636
57. Basic Structure of a Cell
    7526
58. Covalent Bonding (Molecules)
    7470
59. Plant structure adaptations and responses
    7463
60. Real time PCR and it's functions in diagnosis
    7436
61. A Tour of the Cell
    7416
62. Ionic Bonding
    7355
63. Cellular Division
    7232
64. Blood Type Genetics
    6897
65. Mendelian Genetics
    6896
66. To Kill a Mockingbird
    6895
67. Satellite Orbits and Uses NIS
    6840
68. Molecules and Ions
    6823
69. Well logging The Bore Hole
    6758
70. The Immune System
    6592
71. Membrane Structure and Function
    6512
72. Animal Reproduction
    6477
73. Sound
    6473
74. Rocks
    6472
75. The Chemistry of Acids and Bases
    6465
76. Angiosperm Reproduction and Biotechnology
    6393
77. Balancing Chemical Equations
    6378
78. Cell Communication
    6267
79. Plant Diversity
    6263
80. Rate Laws
    6240
81. Mendel and the Gene Idea
    6224
82. Drama
    6215
83. Hybridization of Orbitals
    6200
84. Introduction to Oscillations and Simple Harmonic Motion
    6133
85. Empirical Formula
    6093
86. The Building Blocks of Matter Atoms
    6092
87. Electron Quantum Numbers
    6061
88. Translation. Protein from RNA
    6033
89. Neurons
    5924
90. An Introduction to Metabolism
    5895
91. The Mole
    5817
92. The Structure and Function of Large Biological Molecules
    5763
93. Karyotypes
    5751
94. ADP, ATP and Cellular Respiration
    5736
95. Earthquakes
    5716
96. Cell Membrane + Tissues & Organs Definitions
    5712
97. Endocrine System
    5709
98. Photosynthesis
    5566
99. Conjunction
    5531
100. Classical greek philosophy
     5523

Research and Development, Experimental aerospace engineering center in Serbia (Space Technologies)